Wait longer before exiting _podman_client

At the end of _podman_client we create a mutex that we want the
server to pick up. If we exit too soon, the mutex goes away and
the server test fails. 5 seconds turns out to be not enough of a
wait because, although the server retries the lock call every
5 seconds, it can hit `api_call_2 failed` and wait 10 seconds
before retrying. Let's wait 30 seconds just to be safe.

Signed-off-by: Adam Williamson <awilliam@redhat.com>

tests/_podman_client.pm

@@ -16,7 +16,9 @@ sub run {
     my $ret = script_run "curl http://172.16.2.114";
     mutex_create "podman_connect_done";
     # sleep a bit to give server time to pick up the mutex
-    sleep 5;
+    # server tries every 5 seconds, but an attempt can fail,
+    # and wait 10 seconds before retry
+    sleep 30;
     # die if connection failed
     die "connection failed!" if ($ret);
 }