This patch reverts commit 76c61cdc.

VIR_DOMAIN_DISK_MIRROR_STATE_ABORT says we asked for a block job to be
aborted rather than saying it was aborted. Let's just use
VIR_DOMAIN_DISK_MIRROR_STATE_NONE consistently whenever a block job
finishes since no caller depends on VIR_DOMAIN_DISK_MIRROR_STATE_ABORT
(anymore) to check whether a block job failed or it was cancelled.
Signed-off-by: NJiri Denemark <jdenemar@redhat.com>