added zenmib.sh

depends on this:
  https://github.com/zenoss/platform-build/pull/195

DEMO1 - SUCCESS - zenmib succeeds with --nocommit; do not commit container:
```
# plu@plu-9: SVCID=$(serviced service list|tr -cd '\000-\177'|awk '/Zope/{print $2;exit}'); echo $SVCID
1ieg32637h49pjsfi2nvvgx84
# plu@plu-9: serviced service run -i $SVCID zenmib run --nocommit
I0711 16:11:37.032003 11476 server.go:339] Connected to the control plane at port 10.87.110.39:4979
I0711 16:11:37.054831 11476 server.go:431] Acquiring image from the dfs...
I0711 16:11:37.055587 11476 server.go:433] Acquired!  Starting shell
run --nocommit
2014-07-11 21:11:43,941 INFO zen.ZenMib: Found 1 MIBs to import.
2014-07-11 21:11:43,942 WARNING zen.ZenMib: Unable to find a file that defines SNMPv2-SMI
2014-07-11 21:11:43,942 WARNING zen.ZenMib: Unable to find a file that defines SNMPv2-CONF
2014-07-11 21:11:43,942 WARNING zen.ZenMib: Unable to find a file that defines SNMPv2-TC
2014-07-11 21:11:44,651 WARNING zen.ZenMib: Found a zero index  in OID '1.3.6.1.4.1.14296.1.100.0.0' -- converting to '1.3.6.1.4.1.14296.1.100.0'
2014-07-11 21:11:44,780 WARNING zen.ZenMib: Found a zero index  in OID '1.3.6.1.4.1.14296.1.100.0.0.1' -- converting to '1.3.6.1.4.1.14296.1.100.0.1'
2014-07-11 21:11:44,786 INFO zen.ZenMib: Parsed 40 nodes and 1 notifications from ZENOSS-MIB
2014-07-11 21:11:44,786 INFO zen.ZenMib: Processed 1 MIB file(s)
I0711 16:11:45.113605 11476 shell.go:200] Command returned non-zero exit code 1.  Container not commited.
```

DEMO2 - SUCCESS - zenmib fails; do not commit container:
```
# plu@plu-9: SVCID=$(serviced service list|tr -cd '\000-\177'|awk '/Zope/{print $2;exit}'); echo $SVCID
1ieg32637h49pjsfi2nvvgx84
# plu@plu-9: serviced service run -i $SVCID zenmib run ftp://ftp-sj.cisco.com/pub/mibs/v2/v2.tar.gz
I0711 16:13:06.144491 16030 server.go:339] Connected to the control plane at port 10.87.110.39:4979
I0711 16:13:06.167721 16030 server.go:431] Acquiring image from the dfs...
I0711 16:13:06.167998 16030 server.go:433] Acquired!  Starting shell
2014-07-11 21:13:13,065 ERROR zen.ZenMib: Problems downloading the file from ftp://ftp-sj.cisco.com/pub/mibs/v2/v2.tar.gz: [Errno socket error] [Errno -2] Name or service not known
2014-07-11 21:13:13,065 ERROR zen.ZenMib: No MIB files to load!
I0711 16:13:13.392893 16030 shell.go:200] Command returned non-zero exit code 1.  Container not commited.
```