Add override for huge_pages configrations in nova

Some nova settings for huge_page reservation can be needed when
deploying things like ovs-dpdk to avoid running out of memory.

This change adds in the values override for setting huge_page
reservations as an example to use when overriding nova values.

Change-Id: I9ee13d3a8bcaabf50a449cb2566cfb0fe8212484

nova/values_overrides/cntt.yaml

@@ -0,0 +1,20 @@
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+---
+conf:
+  nova:
+    DEFAULT:
+      reserved_huge_pages:
+        - node:0,size:1GB,count:4
+        - node:1,size:1GB,count:4
+      reserved_host_memory_mb: 512
+...