changes to base nova configuration

- correct typos/syntax errors in configuration scripts
- make config script consistent with other images
- do not create keystone entries in base image script

Change-Id: I42986fe1b9c80c5b0735fd70294bce1a6223a3ca
fix nova-controller pod

remove nova-controller image, which is not meant to be started directly.
add required NEUTRON_SHARED_SECRET environment variable.

Change-Id: Id671c5473db8e6e222b16ccdfd9eaedc872c60fa