Remove vol_type_id cast to str

Volume Type ID is string field, so we don't need to cast it
to str one more time

Change-Id: I8dcbfb770c412624d59c80bebe00d8c27ab0f823
Fix LVM iSCSI driver tgtadm CHAP authentication

Currently CHAP Authentication in LVM iSCSI driver with tgtadm does not work.
This is because the tgtadm helper creates the target configuration file
with an 'IncomingUser' entry, which is ignored by tgtd.
This patch fixes it to 'incominguser'.

Change-Id: I14871985a2a916834122f849238f05b75726bc1a
Closes-Bug: #1329214
Merge "Remove vol_type_id cast to str"
Merge "Fix LVM iSCSI driver tgtadm CHAP authentication"