Introduce Hitachi storage volume driver

This patch introduces Hitachi storage volume driver.

Implements: blueprint hitachi-block-storage-driver

Certification test result for FC:
https://bugs.launchpad.net/cinder/+bug/1336661/+attachment/4189194/+files/FC%20tmp.pTAkWV3eWb

Certification test result for iSCSI:
https://bugs.launchpad.net/cinder/+bug/1336661/+attachment/4189195/+files/iSCSI%20tmp.1Q7C1rkzTY

Change-Id: Ie9b5df6d223b47d176c4e80fcf7e110543ce1d37
Signed-off-by: Seiji Aguchi <seiji.aguchi.tr@hitachi.com>
Merge "Introduce Hitachi storage volume driver"