Implemented running mic under VM

Implemented running mic under VM

If configuration variable USE_VM is set to 1 in jobs/configuration
job_imager will try to run qemu with -hda <mic seed image> and
accelerator choices: kvm:xen:tcg. It means that qemu will first try to
run image with kvm and then with xen if kvm is not found.

There are number of optional VM related parameters that can be set in
jobs/configuration: VM_IMAGE($JENKINS_HOME/mic-seed.tar by default),
VM_MEMORY(8Mb by default) and VM_CPUS(8 cpus by default).

mic appliance implemented in mic-seed expects configuration file in
mic/out directory. It will automatically run mic and put image and other
build results also into mic/out.

Fixes: #1146

Change-Id: I3a1fd07306372912a1909fd4774d06f5e8523f97
Signed-off-by: Ed Bartosh <eduard.bartosh@intel.com>
Reviewed-on: https://otctools.jf.intel.com/review/6306
Tested-by: OTC Tools Tester <ed.bartosh@linux.intel.com>
Reviewed-by: Hasan Wan <hasan.wan@intel.com>