* shell commands completition
* usage of openstack openrc utility to source
environmental variables to use client
Extra:
* removed cassandra env and replaced it with bash code
* reworked creating bash profile
* removed devstack/files/env.sh as it is no longer needed and
everything is available through profile
Depends-On: I579f6bcd5975a32af2a255be41c9b6c4043fa1dc
Depends-On: Ifee5b88ccb632222310aafb1081ecb9c9d085150
Depends-On: I01d0f3d9814376f9358feb23494e1ca5231aedac
Depends-On: I1712a24739438e2d8331a495f18f357749a633c5
Change-Id: I35f5943ae1eadb10dc416179c575cdad62753b69
18f1dad2d8