1. Remove lastore-update-metadata-info.timer (trigger in
lastore-daemon now)
2. Trigger UpdateSource every 3 hours (removed unexpectedly in
cc22ee3eddac0577daa3fe7bd46b0672e0d2062d)
3. Tidy config.go

Change-Id: I7a880a306055e84a8c786f9f1faede8d65c44cb6