Updated openstack/openstack
Project: openstack/oslo.messaging  67e4cc1194a6bb4267e25406872a3ea519ff9fce

Replaced 'e.g.' with 'for example'

According to the IBM Style Guide the Latin abbreviation 'e.g.'
should be replace by 'for example'.

Change-Id: I694df5ed62213e29bdf35f781fd6f310b7df77a6