edit-glance-manage-command-for-recreate-db

As per https://bugs.launchpad.net/glance/+bug/1213197, and subsequent
review at https://review.openstack.org/#/c/47161/ Glance-manage commands
are proposed to be subcommands of 'db'. This would require change to the
script to recreate_db which calls the db_sync command.

Implements blueprint edit-glance-manage-command-for-recreate-db
Change-Id: I9470709ec34896dba7a37fdff4791206bb5ef5ed
Robustify shocco install and config

* shocco has some non-optional prereqs, make sure they are present if
shocco is being installed
* set the path to installed shocco correctly
* add the working dir to .gitignore

Change-Id: If786ea9e28d3595775f7b86d2fe760dff8047f49
support memcache for keystone token backend

Change-Id: I0c85a64932c39264b73cff4f9d952d0dbdf49e5b
Merge "Robustify shocco install and config"
Merge "edit-glance-manage-command-for-recreate-db"
Merge "support memcache for keystone token backend"