Remove deprecated nova_create_flavors.sh script

nova_create_flavors.sh has been deprecated for over a year (since 2013-05-07)

Removing the script, since it is not documented in any current READMEs
or on the Openstack wiki.

Change-Id: Ib6031c2518b8e6d43bb692e0f687a2e287ec494f
Partial-Bug: 1338066
Revert "Store clients in context"

This commit caused a regression in tripleo when trying to signal
waitconditions.
This reverts commit de8b071acf21fe054267619124ac1a0374496185.
Fixes-bug: #1344079

Change-Id: Ib87eb81b687497a6669da38cb43b4f525cafa754
Merge "Revert "Store clients in context""