Removal of unnecessary sample file from repository

Sample file (etc/logging.cnf.sample) is not needed anymore,
since we use openstack common logging now. So, I am removing this file from
Glance repository.

Closes-Bug: #1163075

Change-Id: I7b769998983f34840d525bd3ead4dc38e03f4602
Merge "Removal of unnecessary sample file from repository"