Script to configure cluster params on local ODL installation.

Script to configure cluster params on local ODL installation.

The new script will configure hostname, seed node, etc. in the akka.conf
and modules-shards.conf files. Run the script without params to get the
usage.

Usage: bin/configure_cluster.sh <index> <seed_nodes_list>
 - index: Integer within 1..N, where N is the number of seed nodes.
 - seed_nodes_list: List of seed nodes, separated by comma or space.

The address at the provided index should belong this controller.
When running this script on multiple seed nodes, keep the
seed_node_list same, and vary the index from 1 through N.

Change-Id: Id6b3009a774d6b80896f90a30c6fbd9f4807eaa8
Signed-off-by: Shaleen Saxena <ssaxena@brocade.com>