Adding Keith's rebalance script

* It uses standard testrunner ini files for server information.
* It uses the couchbase-cli, by default it looks in /opt/couchbase
* You can specify t

Adding Keith's rebalance script

* It uses standard testrunner ini files for server information.
* It uses the couchbase-cli, by default it looks in /opt/couchbase
* You can specify the number of nodes to add or remove.
* You can specify the phase based on this specific testcase
(phase 1 is add 24 nodes and remove 12, phase 2 is add 12 and
remove 12, phase 3 is add 12).
By specifying the phase it will choose different nodes to remove.
* It will print out the new master if needed (if you rebalance out the old master)
* It will print out moved vbucket counts
* It will print out moved, created and deleted replica vbucket counts

Change-Id: I0880e567bbcd688913278955077c26036e65e72a
Reviewed-on: http://review.couchbase.org/13944
Tested-by: Karan Kumar <karan@couchbase.com>
Reviewed-by: Keith Batten <kbatten@gmail.com>

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