Add ryu team to the MAINTAINERS file for ofagent and ryu

Change-Id: I02fa641c34248c9e6bbaab5caa66892165308c36
Test against latest glance_store code

Install glance_store from git so we can test Glance against master. This
is useful for both, glance and glance_store gates, to make sure nothing
is broken there.

Change-Id: I6c01165c4384c41f46f2c32d64475703b3178dab
Merge "Test against latest glance_store code"
Merge "Add ryu team to the MAINTAINERS file for ofagent and ryu"