connectors-643. Adding the header 'Accept'='application/json;esl-api-version=10.6' and the content-type 'Content-Type'='application/json;esl-api-version=10.6' on all request which are not involving binaries. Added a FINER level log for calls to log the headers and other details information on the requests. Deleted the log4j.properties from the test since we are not even using log4j.
Merge branch 'dev'