As of 1a50ba2c qemu capabilities probing
takes longer since we timeout waiting for the monitor socket. When
probing qemu for different architectures this can add up so the daemon
auto shutdown timeout is reached and the client doesn't have a chance
to connect. To avoid that inhibit daemon shutdown during driver
initialization (which includes capabilities probing).

This fixes

	http://honk.sigxcpu.org:8001/job/libvirt-tck-debian-wheezy-qemu-session/227/