- Updated multi-blaster.sh and shard_multi_test.sh to allow host and port command line arguments.

- Updated shard_multi_test.sh to print help string and to measure the total rate.

Change-Id: I6ce4b5a6ad194bf7f28e3d04b2f4dc831a304814
Signed-off-by: Jan Medved <jmedved@cisco.com>
(cherry picked from commit 870faf99d213cd23470026acbea6a983ffe5c381)