qemuDomainOpenGraphics: Start job early

qemuDomainOpenGraphics: Start job early

Checking if a domain's definition or if it is active before we got a job
is pointless since the domain might have changed in the meantime.

Luckily libvirtd didn't crash when the API tried to talk to an inactive
domain:

debug : qemuDomainObjBeginJobInternal:2914 : Started job: modify
    (async=none vm=0x7f8f340140c0 name=ble)
debug : qemuDomainObjEnterMonitorInternal:3137 : Entering monitor
    (mon=(nil) vm=0x7f8f340140c0 name=ble)
warning : virObjectLock:319 : Object (nil) ((unknown)) is not a
    virObjectLockable instance
debug : qemuMonitorOpenGraphics:3505 : protocol=spice fd=27
    fdname=graphicsfd skipauth=1
error : qemuMonitorOpenGraphics:3508 : invalid argument: monitor must
    not be NULL
debug : qemuDomainObjExitMonitorInternal:3160 : Exited monitor
    (mon=(nil) vm=0x7f8f340140c0 name=ble)
debug : qemuDomainObjEndJob:3068 : Stopping job: modify (async=none
    vm=0x7f8f340140c0 name=ble)

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>