Read back the driver name after initializing it
Read back the driver name after initializing it

We can try to reuse a storage area by passing an empty value in as the
desired driver, but we need to read the driver name back so that we
can actually report which one we ended up using.

Signed-off-by: Nalin Dahyabhai <f562fcb2a0b898bf0be1afc867ea92325d8f825f@redhat.com>

containers/storage,rhatdan/storage,containers/storage,rhatdan/storage,containers/storage,rhatdan/storage