Use unix sockets by default for reverse proxy communication

Using additional ports increase the chance of conflicting with something
else on the node and is also potentially less efficient. We have used
Unix sockets via a shared directory in OpenShift for a while without any
complaints. I think upstream should do the same.

Signed-off-by: Dmitry Tantsur <dtantsur@protonmail.com>

scripts/ironic-common.sh

@@ -93,8 +93,8 @@ run_ironic_dbsync()
 }
 
 # Use the special value "unix" for unix sockets
-export IRONIC_PRIVATE_PORT=${IRONIC_PRIVATE_PORT:-6388}
-export IRONIC_INSPECTOR_PRIVATE_PORT=${IRONIC_INSPECTOR_PRIVATE_PORT:-5049}
+export IRONIC_PRIVATE_PORT=${IRONIC_PRIVATE_PORT:-unix}
+export IRONIC_INSPECTOR_PRIVATE_PORT=${IRONIC_INSPECTOR_PRIVATE_PORT:-unix}
 
 export IRONIC_ACCESS_PORT=${IRONIC_ACCESS_PORT:-6385}
 export IRONIC_LISTEN_PORT=${IRONIC_LISTEN_PORT:-$IRONIC_ACCESS_PORT}