svirt_attach_disk: Add test cases for pool volume

Add test cases for netfs pool vol with virt_use_nfs sebool set.
Add iscsi and disk pool vol with check rawio capabilitiy.

Signed-off-by: Wayne Sun <gsun@redhat.com>
svirt_attach_disk: Fix typo and TestNAError usage problem

Fix TestNAError implicit substitue problem and s/successed/succeeded/

Signed-off-by: Wayne Sun <gsun@redhat.com>

fix TestNAError usage problem
svirt_attach_disk: Modify rawio capabilitiy check with bit and

Run capsh --decode on host will met problem on rhel6, so change
to use 'bit and' with rawio capabilitiy value.

Bug on rhel6:
  $ capsh --decode=fffffffc00020000
will got endless output in stdout

Signed-off-by: Wayne Sun <gsun@redhat.com>
Merge pull request #302 from waynesun09/svirt_attach_disk

svirt_attach_disk: Add test cases for pool volume