Migrate push-jobs-client to omnibus-chef

Pretty self-explanatory.

/cc @opscode/client-engineers @opscode/release-engineers 
this is probably where the cargo culting comes from, i'm assuming this is actually necessary here though since there's a call to 'autogen.sh' later.  and the reason why looks like we're pulling direct from git.  if we pointed at a released tarball artifact where the configure script already existed, then we could drop these deps.