Add initial version of remote condor_history; only python client
is currently included.  #3897
Add remote query options to condor_history CLI. #3897
Make remote history available under READ authorization. #3897
- Add a non-blocking concurrency-limit.
- Add a limit to the number of history ads scanned.
- If either limit is set to 0, then remote history is disabled.
Rename ifdef'd out option name.  #3897

This way, if we ever get Quill working again, we won't have
conflicting option names.
Merge branch 'V8_1-remote-history'