scheduler.c: Move some message log level to DEBUG
scheduler.c: Move some message log level to DEBUG

Otherwise using "logging level set-all info" makes it impossible to see
anything in VTY due to tons of those two lines appearing.

Change-Id: I9c7500c1e56db0c4dcb474f93c882a9c7c004d55

osmocom/osmo-bts,osmocom/osmo-bts,osmocom/osmo-bts