bringup-cluster: Remove tester pid limits.

By default the container running ovn-tester could use only up to 2048
pids.  With large scale OVN-IC tests (e.g., 500 zones) the tester
(through ovsdbapp) was failing to spawn enough threads to handle all the
database connections.

Remove the pid limit.

NOTE: this is a bit of a band aid because it doesn't fix the real
bottleneck in such scenarios, i.e., the fact that the tester still keeps
long lived connections to all DBs.

Signed-off-by: Dumitru Ceara <dceara@redhat.com>

ovn-fake-multinode-utils/playbooks/bringup-cluster.yml

@@ -4,7 +4,7 @@
   - name: Start tester container
     ansible.builtin.shell: |
       podman run -dt --name=ovn-tester --hostname=ovn-tester \
-                     --privileged ovn/ovn-tester
+                     --pids-limit -1 --privileged ovn/ovn-tester
 
   - name: Add tester container interfaces to OVS bridges
     environment: