NEXUS-6134 - remove 'httpclient' logger, we no longer ship with httpclient 3x
NEXUS-6134 - make sensible defaults for org.apache.http loggers to make debugging outbound headers easier

user will need to simply change org.apache.http to DEBUG now, should they wish to debug outbound headers

Confirmed that changing ROOT logger to DEBUG will not print wire...
Merge pull request #263 from sonatype/NEXUS-6134-http-loggers

TRIVIAL: NEXUS-6134 http loggers