Fix flaky ness of opennav_docking test_docking_server (#4878)#4879

SteveMacenski merged 1 commit intoros-navigation:mainros-navigation/navigation2:mainfrom

ewak:feature/mw/opennav_dock_flakey_testewak/navigation2:feature/mw/opennav_dock_flakey_testCopy head branch name to clipboard