tests: Add createVHBAByStoragePool-by-parent to fchosttest

tests: Add createVHBAByStoragePool-by-parent to fchosttest

Add a new test to fchosttest in order to test creation of our vHBA
via the Storage Pool logic.  Unlike the real code, we cannot yet use
the virVHBA* API's because they (currently) traverse the file system
in order to get the parent vport capable scsi_host. Besides there's
no "real" NPIV device here - so we have to take some liberties, at
least for now.

Instead, we'll follow the node device tests partially in order to
create and destroy the vHBA with the test node devices.

Signed-off-by: John Ferlan <jferlan@redhat.com>