Add service catalog commands

'catalog list' and 'catalog show' for Identity v2

Identity v2 only so far.

Change-Id: I9df0dac3d5bb7c18f38a81bd7d29f8119462d3a5
Acknowlege git.o.o as OpenStack's git server

OpenStack's cannonical git server is at git.o.o this patch
updates the index.rst to reflect that.

Change-Id: I54eeea7fab2e0f64ca9f23f7c328e2ff19721a41
Merge "Add service catalog commands"
Merge "Acknowlege git.o.o as OpenStack's git server"