This commit fixes the issues found adding functional tests.
This fixes the following:
- hpssacli logicaldrive delete shouldn't be called when there
are no RAID arrays (results in failure otherwise)
- trim down the wwn returned to 8-byte hex so that it is same
as the one returned by lsblk.
Change-Id: Ic4e2983a34fa6b3fcf576f9dd46c9d5b66a47848
7617a7d30a