SMI-S Plugin: Fix a constant typo in MegaRAID pool query.

 * Incorrect: Pool.ELEMENT_THIN_VOLUME_FULL
   Correct:   Pool.ELEMENT_TYPE_VOLUME_FULL

Signed-off-by: Gris Ge <fge@redhat.com>
Plugin Test: Fix the sha-bang line of plugin_test.py

 * Changed the sha-bang line of plugin_test.py:
    Old:
        #!/bin/env python2
    Now:
        #!/usr/bin/env python2

Signed-off-by: Gris Ge <fge@redhat.com>
SMI-S Plugin: Restrict VPD83 to NAA Type 3 ID.

 * Only accept NAA Type 3 ID from CIM_StorageVolume as that's what
   '/usr/lib/udev/scsi_id'[1] do.

 * No regression found as those not support NAA Type 3 already filterd out
   by previous regex match '^[a-fA-F0-9]{32}$'.

 * Removed IBM workaround code as NodeWWN is not what we need. It already
   filtered out by previous code.

 * Introduced a non-standard(at least I didn't found) for NetApp, they are
   using 'OtherNameNamespace', 'OtherNameFormat'.

 * Tested on:
    EMC VNX/VMAX
    Fujitsu DS
    HP 3PAR
    Dell
    Dot Hil
    LSI MegaRAID.

 * Not work on(already informed):
    IBM XIV
    HDS AMS

[1] device-mapper-multipath is using that tool to get WWID from SCSI disk.
    while WWID is 3 + VPD83 NAA Type3 ID.

Signed-off-by: Gris Ge <fge@redhat.com>