router,discoverd: Fix sync w/ pruned etcds.

Signed-off-by: Michael Elsdörfer <michael@elsdoerfer.com>
router: Support custom etcd prefix.

Signed-off-by: Michael Elsdörfer <michael@elsdoerfer.com>
Merge branch 'router-etcd-init' into router-miracle2k
Merge branch 'router-custom-prefix' into router-miracle2k