Small update in code to get context path.
Improve javadoc.
Remove unused Logger instance.
Remove unused constant.
Update request interceptor so it sets client service name + properly deal with query parameters.

Bring inline with how resteasy integration works. Assume first part of
path is context path and set this as client service name. Rest of path
is span name.  Also properly deal with requests that have query
parameters. Query parameters won’t be part of span name.