restapi: Apply template on VmPool creation using REST API

The BackendVmPoolsResource.mapToVM method ignored the supplied template.
Now it maps the VmTemplate to VmStatic and supplies it to VM that has
client-supplied changes applied to it.

Change-Id: Ibe3939662562aadaee68ae423beb824c3487b01e
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=948775
Signed-off-by: Martin Betak <mbetak@redhat.com>