Update .gitignore to contain the list of modules

.gitignore

-*
-!/bin
-!/bin/*
-!.mrconfig
-!.gitignore
-!README.md
+/private/swh-private-data/
+/swh-dar/
+/swh-gunicorn/
+/swh-mediawiki/
+/swh-postfix/
+/swh-profile/
+/swh-role/
+/swh-site/
+/swh-systemd/
+/swh-uwsgi/
+/camptocamp-systemd/
+/claranet-varnish/
+/icinga-icinga2/
+/icinga-icingaweb2/
+/inkblot-bind/
+/mosen-cups/
+/openstack-ceph/
+/puppet-extlib/
+/puppet-nginx/
+/puppet-unattended_upgrades/
+/puppetlabs-apache/
+/puppetlabs-apt/
+/puppetlabs-concat/
+/puppetlabs-inifile/
+/puppetlabs-mysql/
+/puppetlabs-ntp/
+/puppetlabs-postgresql/
+/puppetlabs-puppetdb/
+/puppetlabs-stdlib/
+/puppetlabs-vcsrepo/
+/ripienaar-module_data/
+/rlenglet-debconf_package/
+/saz-locales/
+/saz-memcached/
+/saz-resolv_conf/
+/saz-ssh/
+/saz-sudo/
+/saz-timezone/
+/ssm-hitch/
+/ssm-munin/
+/stm-debconf/
+/theforeman-puppet/
+/thias-php/
+/trepasi-debnet/
+/wikimedia-kafka/
+/wikimedia-zookeeper/