Add files for auto-building RPM packages

This isn't ready to be enabled yet, it is just an initial commit to get
the files into the salt-jenkins repo.
Add sshpass installation for cloud tests
Merge pull request #49 from terminalmage/add-buildpackage-script

Add files for auto-building RPM packages
Remove buildpackage script and spec

These are being moved to salt proper
Reconfigure buildpackage SLS to run package build from git checkout
Merge pull request #51 from rallytime/add_sshpass

Add sshpass installation for cloud tests
Spelling fix...blerg.
Merge pull request #52 from rallytime/add_sshpass

Spelling fix...blerg.
jinja-ify python call so it works for CentOS 5
Fix jinja error
Fix jinja comparison
Define "platform" variable
add debug code for buildpackage
Switch to grains["osrelease"]|int to check osmajorrelease

The minion deployed to the build VMs seems to be an older version, where
a bug recently fixed in the osmajorrelease grain has not been fixed.
This makes sense as we don't want the build VM to be at the mercy of
code in the branch being tested.

This commit coerces the value of grains["osrelease"] to an integer in
order to determine the major release.
Fix jinja "set" command for RPM spec
Use pillar data for build, artifact, and source dirs

Also added a ton of comments
Add and depend on argparse if Py26