Ocean init mode: one message per processor about changing min depth

[xylar]

The following lines:
https://github.com/MPAS-Dev/MPAS-Model/blob/ocean/develop/src/core_ocean/mode_init/mpas_ocn_init_global_ocean.F#L897-L899
print a message like:

config_global_ocean_minimum_depth=   15.00 m.  Setting minimum layer index to     2 with a bottom depth of    20.00 m.

once for each processor in init mode for core_ocean. This is needlessly annoying when looking through the log files.