Add KVM hypervisor code

ht_kvm.py contains the code for ganeti to work under kvm.
This patch also modifies Makefile.am to ship that file, and
lib/hypervisor/__init__.py to import it, and add kvm to the
hypervisors map.

Reviewed-by: imsnah

Makefile.am

@@ -89,6 +89,7 @@ hypervisor_PYTHON = \
 	lib/hypervisor/__init__.py \
 	lib/hypervisor/hv_base.py \
 	lib/hypervisor/hv_fake.py \
+	lib/hypervisor/hv_kvm.py \
 	lib/hypervisor/hv_xen.py
 
 rapi_PYTHON = \

lib/hypervisor/__init__.py

@@ -29,12 +29,14 @@ from ganeti import errors
 
 from ganeti.hypervisor import hv_fake
 from ganeti.hypervisor import hv_xen
+from ganeti.hypervisor import hv_kvm
 
 
 _HYPERVISOR_MAP = {
     constants.HT_XEN_PVM30: hv_xen.XenPvmHypervisor,
     constants.HT_XEN_HVM31: hv_xen.XenHvmHypervisor,
     constants.HT_FAKE: hv_fake.FakeHypervisor,
+    constants.HT_KVM: hv_kvm.KVMHypervisor,
     }