Remove pin of fast_gettext
Remove pin of fast_gettext

This is no longer required because ruby >= 2.1 is already available[1].

[1] b93ecf8bff9184cc76ecb3d3912cfd9c3158d406

Change-Id: I91854630489c92307e8e84f8695ccd4a57362af9

openstack/puppet-openstack-integration,openstack/puppet-openstack-integration,openstack/puppet-openstack-integration