added Solaris support

This PR adds support for Solaris and closes issue https://github.com/Phil-Friderici/puppet-module-afs/issues/1

ACHTUNG!!!:
The variable which contains the package names was renamed from $packages to $package_name.
You need to adjust the variable name only if you have specified a different value for it.
If you were using the OS defaults ('USE_DEFAULTS') there is nothing to do for you :)