This should resolve some of the timing issues experienced after switching from blocking to non-blocking shout api
* Wait ten seconds before declearing the shout server unreachable
* Fix a state where it would never attempt to connect if it had previously failed

It isn't perfect yet, but I'd like some testing on it from other setups


git-svn-id: https://svn.musicpd.org/mpd/trunk@6523 09075e82-0dd4-0310-85a5-a0d7c8717e4f