Add option pattern to cli ref tool
Add option pattern to cli ref tool

The python-troveclinet 2.0.0 has the new option
--instance "<opt=value,opt=value,...>"
on trove cluster-create.

Change-Id: I11de253d33b2051175d09e9b3e760f2055931d0e

openstack/openstack-doc-tools,openstack/openstack-doc-tools