bump omnibus-ruby and omnibus-software

- omnibus-ruby: solaris builds using pkgmk instead of fpm
- omnibus-ruby: support for tar.xz files (unused in omnibus-chef)
- omnibus-ruby: support for pre-install scripts (unused in omnibus-chef)
- omnibus-ruby: bump default ncpus to 3 and jobs to 2 (build parallelism)
- omnibus-software: chef windows/unix gemspec split
- omnibus-software: /opt/chef/bin/ohai missing fix
- omnibus-software: ENV['OHAI_GIT_REV'] support
- omnibus-software: numerous aix fixes
- omnibus-software: make -j everywhere
only install the windows gem on windows

- we build both now due to the split gemspec, need to only install
  the windows version
numerous fixes for install scripts

- conditionally setup symlinks for chef-10-vs-chef-11
- syntax fixes for solaris
test for symlink presence

nothing else in the infrastructure tests for the symlinks getting
setup correctly, so we do that here.

- we clean up the symlinks from the previous install which may have
  been left behind due to bad/missing/whatever postremove scripts
- we test for the presence of the symlinks after installing the
  package
- for now only test for the ones in common