Glance image devstack-62v3
Glance image devstack-62v3

* reduced size to 1.95 GB
* remove remnant logs
* updated all repos to reduce console-log size & number of lines when updating repos + less time in deploy
* updated pip to 7.1.1
* full OS updates
* clean apt-cache
cloudbase/cinder-ci,rbuzatu90/cinder-ci,rbuzatu90/cinder-ci,costingalan/cinder-ci,cloudbase/cinder-ci,costingalan/cinder-ci