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
fix nova-controller pod

remove nova-controller image, which is not meant to be started directly.
add required NEUTRON_SHARED_SECRET environment variable.
have start.sh source in common configuration script
Nova has an undeclared dependency on python-cinderclient

Nova imports python-cinderclinet, which is not present by just
installing python-nova-api.  Hard yum-install it until upstream
fixes packaging.
introduce conductor to common configuration

- source in common configuration script
- actually sync the database
introduce scheduler to common configuration