BmiClientSingularity should use own logger

[sverhoeven]

It uses global logging at

grpc4bmi/grpc4bmi/bmi_client_singularity.py

Line 222 in 1882d5f

logging.info(f'Running {image} singularity container on port {port}')

I should be using a local logger with

import logging
logger = logging.getLogger(__name__)
...
logger.info('Running /....sif singularity container on port 41749')

Then its message can be silenced selectively.