block: remove BLOCK_OPT_NOCOW from vdi_create_opts

In commit 7074786, the need for NOCOW was removed from the vdi driver,
as we removed the the posix calls.  However, the BLOCK_OPT_NOCOW was not
removed from vdi_create_opts.  This was a mistake - remove the opt from
there as well.

Signed-off-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: e189364de11929d8fa04722f5d845de0a9834d44.1417620301.git.jcody@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
block: remove BLOCK_OPT_NOCOW from vpc_create_opts

In commit fef6070, the need for NOCOW was removed from the vpc driver,
as we removed the the posix calls.  However, the BLOCK_OPT_NOCOW was not
removed from vpc_create_opts.  This was a mistake - remove the opt from
there as well.

Signed-off-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 8ba076fa725fed681cde7d8afc4fb239ae06a9c6.1417620301.git.jcody@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>