packaging: spec: make docker optional
packaging: spec: make docker optional

Make docker packaging optional

Change-Id: I912c7044ad696edebfe08c7452f06456c3f8733a
Signed-off-by: Sandro Bonazzola <fcb014d63786651910af5db2ecc5316c668188ef@redhat.com>

eayun/ovirt-engine,zerodengxinchao/ovirt-engine,yapengsong/ovirt-engine,yingyun001/ovirt-engine,yapengsong/ovirt-engine,eayun/ovirt-engine,eayun/ovirt-engine,yapengsong/ovirt-engine,yingyun001/ovirt-engine,eayun/ovirt-engine,walteryang47/ovirt-engine,zerodengxinchao/ovirt-engine,zerodengxinchao/ovirt-engine,yingyun001/ovirt-engine,zerodengxinchao/ovirt-engine,yingyun001/ovirt-engine,yapengsong/ovirt-engine,yapengsong/ovirt-engine,eayun/ovirt-engine,yingyun001/ovirt-engine,walteryang47/ovirt-engine,walteryang47/ovirt-engine,walteryang47/ovirt-engine,zerodengxinchao/ovirt-engine,walteryang47/ovirt-engine