Add ContainerNovaLibvirtUlimit to tweak Ulimits

Ulimit defaults in Kolla for libvirt container provide sub-uptimal
performance. Allow to override those and also provide opinionated
defaults for TripleO. Keep those defaults in sync with that we need
in the nova-compute & cinder-volume containers to avoid potential
issues with ceph.

Related: https://bugzilla.redhat.com/show_bug.cgi?id=1721434

Related-bug: #1762455

Change-Id: I7fa26a8d9d3b4029bdd518409013246720b057e3
Signed-off-by: Bogdan Dobrelya <bdobreli@redhat.com>

deployment/nova/nova-libvirt-container-puppet.yaml

@@ -12,6 +12,10 @@ parameters:
   ContainerNovaLibvirtConfigImage:
     description: The container image to use for the nova_libvirt config_volume
     type: string
+  ContainerNovaLibvirtUlimit:
+    default: ['nofile=131072', 'nproc=126960']
+    description: ulimit for Nova Libvirt Container
+    type: comma_delimited_list
   ServiceData:
     default: {}
     description: Dictionary packing service data
@@ -600,6 +604,7 @@ outputs:
           nova_virtlogd:
             start_order: 0
             image: {get_param: ContainerNovaLibvirtImage}
+            ulimit: {get_param: ContainerNovaLibvirtUlimit}
             net: host
             pid: host
             security_opt: label=disable
@@ -625,6 +630,7 @@ outputs:
           nova_libvirt:
             start_order: 1
             image: {get_param: ContainerNovaLibvirtImage}
+            ulimit: {get_param: ContainerNovaLibvirtUlimit}
             net: host
             pid: host
             privileged: true

releasenotes/notes/more_params_to_configure_ulimit-82057bf64d7173a8.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Add `ContainerNovaLibvirtUlimit` to configure Ulimit for containerized
+    Libvirt. Defaults to ``nofile=131072,nproc=126960``.