CCBC-932: display threshold logging tracer summary on INFO level
CCBC-932: display threshold logging tracer summary on INFO level

Change-Id: I247f05e86e728a4d6f03735e6753a0640ce8e38a
Reviewed-on: http://review.couchbase.org/94402
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Ellis Breen <9d8041ac7ead8d3e1f3217c04c7ed5e3098c2381@couchbase.com>

couchbase/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,couchbase/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,kojiromike/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,kojiromike/libcouchbase,avsej/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,couchbase/libcouchbase,kojiromike/libcouchbase,avsej/libcouchbase,couchbase/libcouchbase