CloudByte iSCSI cinder driver currently does not support
iSCSI CHAP security setting. This opens a security vulnerability
whereby any host machine can mount a CloudByte iSCSI volumes
created via OpenStack.
This patch adds CHAP authentication support for the CloudByte iSCSI
cinder driver.
Admin has to manually add the auth group and chap username/password in
CloudByte storage. Driver uses the first user found in auth group.