Move unused rubygem-less, less-rails, commonjs deps to plugins

Looks like this was added back in 1.2 when we went to SCL, but core doesn't use it.  Instead it will be used by rubygem-bastion once it appears in the plugins repo.

Builds of foreman, hopefully proving we don't need it:
http://koji.katello.org/koji/taskinfo?taskID=170857 f19
http://koji.katello.org/koji/taskinfo?taskID=170858 el6
http://koji.katello.org/koji/taskinfo?taskID=170861 el7

Already retagged, so should be good to go.  Once merged, I'll untag it from the old tags.