Exec[nickserver_bundler_update] / bundle install fails randomly for nickserver

   - [single.bitmask.local] err: /Stage[main]/Site_nickserver/Exec[nickserver_bundler_update]/returns: change from notrun to 0 failed: /bin/bash -c "/usr/bin/bundle check || /usr/bin/bundle install --path vendor/bundle" returned 5 instead of one of [0] at /srv/leap/puppet/modules/site_nickserver/manifests/init.pp:92
   - [single.bitmask.local] err: /Stage[main]/Site_nickserver/Exec[nickserver_bundler_update]: Failed to call refresh: /bin/bash -c "/usr/bin/bundle check || /usr/bin/bundle install --path vendor/bundle" returned 5 instead of one of [0] at /srv/leap/puppet/modules/site_nickserver/manifests/init.pp:92

i linked to a similar issue where bundle install fails for the webapp (#6015)

(from redmine: created on 2014-08-27, closed on 2014-12-10, relates #6015)