This adds configure options to control the following block drivers:

* Bochs
* Cloop
* Dmg
* Qcow (V1)
* Vdi
* Vvfat
* qed
* parallels
* sheepdog

Each of these defaults to being enabled.
Signed-off-by: NJeff Cody <jcody@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>
Message-id: 20181107063644.2254-1-armbru@redhat.com
Signed-off-by: NMax Reitz <mreitz@redhat.com>