Improve affinity router logging

Explore several possible improvements to affinity router logging:

• Add kafka logging support (see bbsim and kafka-topic-exporter as examples)
• Look into moving items to TRACE level to reduce logging noise.
• Look into finer-grained control, similar to ONOS, that could adjust levels of different groups of log message. See if an existing golang package supports this feature.
• Examine how frames are printed (currently a series of bytes printed as decimal?) and see if they can be printed in a way that's easier to use. See if it's possible to decode gRPC frames and print the fields.
• Ensure that source/destination addresses and other header information is present.
• As arouter has a configuration/control API, see if that can be extended to allow log levels to be adjusted dynamically.
• Log-level should be configurable from helm chart values.yaml