Add versionadded directive to docstring

This adds a versionadded directive to the docstring for the new 'random'
keyword in cron states.
Add versionadded directive to docstring

This adds the versionadded directive to the docstring for the new "pkgs"
support added to pkg.purged/removed states.
pkgin: fix purge() function

This function needed to accept the "pkgs" argument and pass it through
to remove(). Without this change, pkg.purged states will traceback.
Merge pull request #5611 from terminalmage/quickfix

Use versionadded directive to denote new features