Cosmetic fix to the agent's HTTP check function which always formats the result as "HTTP GET ...", ignoring any non-GET supplied HTTP method such as POST, PUT, etc.
There were places where we still didn't have the script vs. args sorted
correctly so changed all the logging to be just based on check IDs and
also made everything uniform.
Also removed some annoying debug logging, and moved some of the large output
logging to TRACE level.
Closes#3602
