client mode: wait a bit for the server to start up if
it was spawned by the client (to solve buildbot failure,
presumably)

axe stray "aprerr" emit from aprerr()


git-svn-id: https://svn.apache.org/repos/asf/apr/apr/trunk@1523853 13f79535-47bb-0310-9956-ffa450edef68