Use stdout_callback yaml for network-integration tests (#56102)

This gives us a little more structure to our console logs, which make it
easier for machines / humans to parse. It will be helpful once the
ansible network team starts importing this data into elastic-recheck.

Signed-off-by: Paul Belanger <pabelanger@redhat.com>

test/integration/network-integration.cfg

@@ -4,6 +4,7 @@
 [defaults]
 host_key_checking = False
 log_path = /tmp/ansible-test.out
+stdout_callback = yaml
 
 # allow cleanup handlers to run when tests fail
 force_handlers = True