Cache documentation about differences in files.
Cache documentation about differences in files.

This patch adds more details to the documentation about the
``glance-api.conf`` and ``glance-cache.conf``.

Closes-Bug: 1531906
Change-Id: I2bfd2a44992850dd74b9e835f803fd878706ccad

rajalokan/glance,openstack/glance,stevelle/glance,openstack/glance,klmitch/glance,rajalokan/glance,klmitch/glance,openstack/glance,stevelle/glance