pod create: add --infra-conmon-pidfile

Add an `--infra-conmon-pidfile` flag to `podman-pod-create` to write the
infra container's conmon process ID to a specified path.  Several
container sub-commands already support `--conmon-pidfile` which is
especially helpful to allow for systemd to access and track the conmon
processes.  This allows for easily tracking the conmon process of a
pod's infra container.

Signed-off-by: Valentin Rothberg <rothberg@redhat.com>

completions/bash/podman

@@ -3098,6 +3098,7 @@ _podman_pod_create() {
       --dns-opt
       --dns-search
       --infra-command
+      --infra-conmon-pidfile
       --infra-image
       --ip
       --label-file