This patch enables robust and complete testing of a compute scenario
where RBD is used for Cinder and Nova.
* Allow cinder.pp and nova.pp to configure RBD backend.
* Switch scenario001 to run Cinder and Nova with RBD backend.
* Update README with more documentation about Cinder & Nova backends.
* Configure volume_clear option to 'none' so volumes are quickly
deleted.
* Enable rbd_default_features to 15 to increase ceph performances.
* Increase compute build_interval in Tempest to 60s, useful for
Bootfromvolume test where instance deletion can take time with RBD
backend.
Depends-On: I69a7d40e7d1847be06a843986ace4f0602272fe1
Depends-On: I7302b89da5a995e779ec349ab0c0f519c69a3a98
Depends-On: Ic410cb66e7620b6ca6acbea38360d8dd890000c9
Change-Id: I5c8d9cf2ff8fc361553b3eed73b697ad87170434
* Configure Ceph to use 'cephx' authentification method.
* Manage Admin, Mon and Clients keys.
* Manage pools for Glance, Cinder and Nova, used for RBD backend.
Depends-On: Ied38afc03d68f7868b1d1320752a48989fa2d018
Change-Id: I23b1163faf3253daa74c57121cd8e5da4f04cff9
