adding UNDO_REQUIREMENTS=False to the localrc.rc

This will stop devstack from clobbering your modified files when you are
working with a repo and then rerunning an install to clean up the vm.

Change-Id: I53c313beab0b1e729a00ca5154f11ec65817c744
Bugfix of repeating lines in configuration file

Both the following files contain multiple dbaas_image keys
1.tests/integration/core.test.conf
2.scripts/conf/test_begin.conf

They have been cleaned up in the fix.

Closes-Bug: #1269813

Change-Id: Ie749b4101e31a0c250ff0f68b552e99507f94fdb
Merge "Bugfix of repeating lines in configuration file"
Merge "adding UNDO_REQUIREMENTS=False to the localrc.rc"
Initial support for single instance Cassandra Database

Reasons
- this code adds ability to create/delete instance
with mongodb service type. No other operations supported.
- trove should support multiple extensions. One of the is NoSQL support.
Main goal is to add support for Apache Cassandra NoSQL database.

Changes:
- this code adds ability to create/delete instance
with cassandra service type. No other operations supported;
- adding datastore/version registration for cassandra

Change-Id: I67733f0ba18aae513465d66bb48e44bbb316a575
Implements: blueprint cassandra-db-support