measurment.c: Introduce INFO category for DMEAS logging
measurment.c: Introduce INFO category for DMEAS logging

There's no point in either having full verbosity in DEBUG level
and not logging any measurement related information in INFO.  Let's
at least print the results at the end of each measurement period in INFO
level.

Change-Id: I2c870531478c05ce31cc1015597a068a4a76cf99

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