Right now it is hard to identify what request consumer task fires off by looking at the log files, making it harder to provide accurate log file snippets to people who need them. When a request consumer starts up, it should:

1. Indicate which consumer component it is (stats, recommendation, etc)
2. Repeat its command line arguments to indicate which command is running.

Ideally we could follow this form: 

"<blank line>

(component) starting. command line: <cmd line>"

e.g:

"<blank line>

request_candidate_sets starting. command line: --top=40 --similar=15"