Add flag to set the Name of the sphinx instance

Removed the static component name, and added a flag in for newrelicName
to be passed into the NR component on the command line.

./sphinx_agent --verbose=true --sphinx-host=127.0.0.1 --sphinx-port=9312
--newrelic-license=[LICENSE] -newrelic-name=[NameOfInstance]

This is in the event that your infrastructure has more than one sphinx
instance to track.