Clean up peer logging for improved serviceability.

INFO level log had a lot of debug information, making it impossible
to find important INFO information and errors through the noise.
Changed most of the debug information to use DEBUG level.

After this change, during normal transaction processing there
will be a single entry in info log per block with messages
like this:

Channel [myc1]: Created block [1] with 43 transaction(s)
Channel [myc1]: Created block [2] with 14 transaction(s)
Channel [myc1]: Created block [3] with 26 transaction(s)

This will make it easy to spot any anomilies in the logs, while
still tracking block progress.

Confirmed there are good INFO messages for important events
such as peer initialization and channel creation.

Removed data content from debug messages for enhanced privacy.

Change-Id: I3a0b2f3a07d5c7dcf388a609d11cfa3bcf7bb065
Signed-off-by: denyeart <enyeart@us.ibm.com>