simplify build process

Also updated:
  http://jenkins.zendev.org/job/zminion/

DEMO - build zminion:
```
~/src/europa/src/golang/src/github.com/zenoss/zminion
# plu@plu-9: make
godep go build -ldflags "-X main.Version 0.1.0 -X main.Gitcommit 'c77da296e65f1027e662821783a13d3f14cbe568' -X main.Gitbranch 'feature/TA22293' -X main.Date 'Thu Sep  4 15:54:59 UTC 2014' -X main.Buildtag '0'"
chown 1000:1000 zminion
~/src/europa/src/golang/src/github.com/zenoss/zminion
# plu@plu-9: ls -l
total 7824
-rwxrwxr-x 1 plu plu     236 Sep  2 13:48 gitstatus.sh
drwxrwxr-x 3 plu plu    4096 Sep  4 10:52 Godeps
drwxrwxr-x 2 plu plu    4096 Sep  4 10:44 hack
-rw-rw-r-- 1 plu plu   18026 Aug 29 11:03 LICENSE
-rw-rw-r-- 1 plu plu    8788 Sep  3 13:10 main.go
-rw-rw-r-- 1 plu plu    3485 Sep  4 10:44 makefile
-rw-rw-r-- 1 plu plu      67 Aug 29 11:03 README.md
-rw-rw-r-- 1 plu plu       6 Aug 29 13:31 VERSION
-rwxr-xr-x 1 plu plu 7953720 Sep  4 10:55 zminion
```

DEMO - clean:
```
~/src/europa/src/golang/src/github.com/zenoss/zminion
# plu@plu-9: make clean
go clean
rm -f *.deb
rm -f *.rpm
rm -f *.tgz
~/src/europa/src/golang/src/github.com/zenoss/zminion
# plu@plu-9: ls -l
total 56
-rwxrwxr-x 1 plu plu   236 Sep  2 13:48 gitstatus.sh
drwxrwxr-x 3 plu plu  4096 Sep  4 10:52 Godeps
drwxrwxr-x 2 plu plu  4096 Sep  4 10:44 hack
-rw-rw-r-- 1 plu plu 18026 Aug 29 11:03 LICENSE
-rw-rw-r-- 1 plu plu  8788 Sep  3 13:10 main.go
-rw-rw-r-- 1 plu plu  3485 Sep  4 10:44 makefile
-rw-rw-r-- 1 plu plu    67 Aug 29 11:03 README.md
-rw-rw-r-- 1 plu plu     6 Aug 29 13:31 VERSION
```

DEMO - make tgz in docker:
```
~/src/europa/src/golang/src/github.com/zenoss/zminion
# plu@plu-9: make docker-tgz
docker build -t zenoss/zminion-build:0.1.0 hack
Sending build context to Docker daemon 4.096 kB
Sending build context to Docker daemon 
Step 0 : FROM ubuntu:trusty
 ---> c4ff7513909d
Step 1 : MAINTAINER Zenoss, Inc <dev@zenoss.com>
 ---> Running in 0577339fabb4
 ---> f74763849277
Removing intermediate container 0577339fabb4
Step 2 : RUN apt-get update -qq
 ---> Running in 625d42ea8c9e
 ---> 48cc5c494b72
Removing intermediate container 625d42ea8c9e
Step 3 : RUN apt-get install -qqy ca-certificates wget curl git
 ---> Running in fb89cd7247e0
debconf: unable to initialize frontend: Dialog
...
Removing intermediate container fb89cd7247e0
Step 4 : RUN curl -s https://storage.googleapis.com/golang/go1.3.1.linux-amd64.tar.gz | tar -v -C /usr/local -xz
 ---> Running in 1b13d6588d29
go/AUTHORS
...
 ---> e99245db44f3
Removing intermediate container 1b13d6588d29
Step 5 : ENV GOPATH  /go
 ---> Running in 47fa47a589fb
 ---> aedd8678ebef
Removing intermediate container 47fa47a589fb
Step 6 : ENV PATH $PATH:/go/bin:/usr/local/go/bin
 ---> Running in b56aa1e93589
 ---> 09c27c0b3040
Removing intermediate container b56aa1e93589
Step 7 : RUN apt-get install -y -q make ruby ruby-dev rpm
 ---> Running in 6d17d9a0a619
Reading package lists...
Building dependency tree...
Reading state information...
The following extra packages will be installed:
  binutils cpp cpp-4.8 debugedit gcc gcc-4.8 libasan0 libatomic1 libc-dev-bin
  libc6 libc6-dev libcloog-isl4 libelf1 libgcc-4.8-dev libgmp10 libgomp1
  libisl10 libitm1 liblua5.2-0 libmpc3 libmpfr4 libnspr4 libnss3 libnss3-nssdb
  libquadmath0 librpm3 librpmbuild3 librpmio3 librpmsign1 libruby1.9.1
  libtsan0 libyaml-0-2 linux-libc-dev manpages manpages-dev rpm-common
  rpm2cpio ruby1.9.1 ruby1.9.1-dev
Suggested packages:
  binutils-doc cpp-doc gcc-4.8-locales rpm-i18n gcc-multilib autoconf
  automake1.9 libtool flex bison gdb gcc-doc gcc-4.8-multilib gcc-4.8-doc
  libgcc1-dbg libgomp1-dbg libitm1-dbg libatomic1-dbg libasan0-dbg
  libtsan0-dbg libbacktrace1-dbg libquadmath0-dbg binutils-gold glibc-doc
  make-doc man-browser alien elfutils ri ruby1.9.1-examples ri1.9.1 graphviz
  ruby-switch
The following NEW packages will be installed:
  binutils cpp cpp-4.8 debugedit gcc gcc-4.8 libasan0 libatomic1 libc-dev-bin
  libc6-dev libcloog-isl4 libelf1 libgcc-4.8-dev libgmp10 libgomp1 libisl10
  libitm1 liblua5.2-0 libmpc3 libmpfr4 libnspr4 libnss3 libnss3-nssdb
  libquadmath0 librpm3 librpmbuild3 librpmio3 librpmsign1 libruby1.9.1
  libtsan0 libyaml-0-2 linux-libc-dev make manpages manpages-dev rpm
  rpm-common rpm2cpio ruby ruby-dev ruby1.9.1 ruby1.9.1-dev
The following packages will be upgraded:
  libc6
1 upgraded, 42 newly installed, 0 to remove and 7 not upgraded.
Need to get 30.1 MB of archives.
After this operation, 95.4 MB of additional disk space will be used.
...
 ---> 6405315d2f9d
Removing intermediate container 6d17d9a0a619
Step 8 : RUN gem install fpm
 ---> Running in 081dddf89287
Building native extensions.  This could take a while...
...
 ---> 8d7b5200e13a
Removing intermediate container 081dddf89287
Step 9 : RUN apt-get install -qqy mercurial
 ---> Running in c4d159ba0f5e
debconf: unable to initialize frontend: Dialog
...
 ---> 6149816718e6
Removing intermediate container c4d159ba0f5e
Step 10 : RUN go get github.com/tools/godep
 ---> Running in a65cf4d66356
 ---> 1b3954fff6a7
Removing intermediate container a65cf4d66356
Step 11 : WORKDIR /go/src/github.com/zenoss/zminion
 ---> Running in 1a2c841fe638
 ---> 45400362be7f
Removing intermediate container 1a2c841fe638
Successfully built 45400362be7f
docker run --rm -v `pwd`:/go/src/github.com/zenoss/zminion -e DUID=1000 -e DGID=1000 zenoss/zminion-build:0.1.0 make tgz
godep go build -ldflags "-X main.Version 0.1.0 -X main.Gitcommit 'c77da296e65f1027e662821783a13d3f14cbe568' -X main.Gitbranch 'feature/TA22293' -X main.Date 'Thu Sep  4 15:59:14 UTC 2014' -X main.Buildtag '0'"
chown 1000:1000 zminion
mkdir -p /tmp/pkgroot/usr/bin
cp -v zminion /tmp/pkgroot/usr/bin
'zminion' -> '/tmp/pkgroot/usr/bin/zminion'
tar cvfz /tmp/zminion-c77da296e65f1027e662821783a13d3f14cbe568.tgz -C /tmp/pkgroot/usr .
./
./bin/
./bin/zminion
chown 1000:1000 /tmp/zminion-c77da296e65f1027e662821783a13d3f14cbe568.tgz
cp -p /tmp/zminion-c77da296e65f1027e662821783a13d3f14cbe568.tgz .
~/src/europa/src/golang/src/github.com/zenoss/zminion
# plu@plu-9: ls -al
total 9968
drwxrwxr-x 5 plu plu    4096 Sep  4 10:59 .
drwxrwxr-x 9 plu plu    4096 Sep  4 10:32 ..
drwxrwxr-x 8 plu plu    4096 Sep  4 10:59 .git
-rw-r--r-- 1 plu plu     333 Sep  2 13:48 .gitignore
-rwxrwxr-x 1 plu plu     236 Sep  2 13:48 gitstatus.sh
drwxrwxr-x 3 plu plu    4096 Sep  4 10:52 Godeps
drwxrwxr-x 2 plu plu    4096 Sep  4 10:44 hack
-rw-rw-r-- 1 plu plu   18026 Aug 29 11:03 LICENSE
-rw-rw-r-- 1 plu plu    8788 Sep  3 13:10 main.go
-rw-rw-r-- 1 plu plu    3485 Sep  4 10:44 makefile
-rw-rw-r-- 1 plu plu      67 Aug 29 11:03 README.md
-rw-rw-r-- 1 plu plu       6 Aug 29 13:31 VERSION
-rwxr-xr-x 1 plu plu 7953344 Sep  4 10:59 zminion
-rw-r--r-- 1 plu plu 2176716 Sep  4 10:59 zminion-c77da296e65f1027e662821783a13d3f14cbe568.tgz
~/src/europa/src/golang/src/github.com/zenoss/zminion
# plu@plu-9: git l | head -1
c77da296e65f1027e662821783a13d3f14cbe568 simplify build process
# plu@plu-9: tar -tzvf zminion-c77da296e65f1027e662821783a13d3f14cbe568.tgz
drwxr-xr-x root/root         0 2014-09-04 10:59 ./
drwxr-xr-x root/root         0 2014-09-04 10:59 ./bin/
-rwxr-xr-x root/root   7953344 2014-09-04 10:59 ./bin/zminion
```