set RUBYLIB when running bundle in portusctl

We have found that under certain circumstances, portusctl fails to run
bundler.

After debugging it, we found out that on our test machine RUBYLIB was
set as

/usr/lib64/ruby/gems/2.1.0/gems/bundler-1.10.6/lib/

which was causing bundler not being able to run, since this is a
different version than the one we have in /srv/Portus/vendor/....

My guess is that this is because of rubygem-bundler being installed on
that system.

This commit sets that environment variable to our bundler directory.

fix issue#612

packaging/suse/bin/portusctl

@@ -3,6 +3,7 @@
 export RAILS_ENV=production
 export GEM_PATH=/srv/Portus/vendor/bundle/ruby/2.1.0/
 export BUNDLER_BIN=/srv/Portus/vendor/bundle/ruby/2.1.0/bin/bundler.ruby2.1
+export RUBYLIB=$(ls -d /srv/Portus/vendor/bundle/ruby/2.1.0/gems/bundler*)/lib/
 
 cd /srv/Portus
 $BUNDLER_BIN exec packaging/suse/portusctl/bin/portusctl "$@"