Deperecate support for Xen and VMWare

The XenAPIDriver driver[1] and the vmwareapi driver[2] were deprecated
in nova, so support for these drivers should be also deprecated.

[1] af280ffe3098b84123eae218989ea056e9935bf1
[2] d98d72828505d250698fcab7cd310820b3a52f7a

Change-Id: Ie9d815b7b3377a9641cc80d11bf6df329331388a

manifests/compute/vmware.pp

@@ -1,4 +1,6 @@
+# == Class: nova::compute::vmware
 #
+# DEPRECATED !
 # Configure the VMware compute driver for nova.
 #
 # === Parameters
@@ -74,6 +76,9 @@ class nova::compute::vmware(
 
   include nova::deps
 
+  warning('The nova::compute::vmware class is deprecated and will be removed \
+in a future release. The vmwareapi driver has been deprecated in nova')
+
   nova_config {
     'DEFAULT/compute_driver':    value => $compute_driver;
     'vmware/host_ip':            value => $host_ip;

manifests/compute/xenserver.pp

@@ -1,5 +1,6 @@
 # == Class: nova::compute::xenserver
 #
+# DEPRECATED !
 # Configures nova-compute to manage xen guests
 #
 # === Parameters:
@@ -275,6 +276,9 @@ class nova::compute::xenserver(
 
   include nova::deps
 
+  warning('The nova::compute::xenapi class is deprecated and will be removed \
+in a future release. The XenAPIDriver driver has been deprecated in nova')
+
   nova_config {
     'DEFAULT/compute_driver':                          value => $compute_driver;
     'xenserver/connection_url':                        value => $connection_url;

releasenotes/notes/deprecate-hypervisors-d820752c9d739bbe.yaml

@@ -0,0 +1,10 @@
+---
+deprecations:
+  - |
+    The ``nova::compute::xenapi`` class has been deprecated and will be removed
+    in a future release. The XenApiDriver driver has already been deprecated in
+    nova.
+  - |
+    The ``nova::compute::vmware`` class has been deprecated and will be removed
+    in a future release. The vmwareapi driver has already been deprecated in
+    nova.