Various fixes to htcondor ce tools

* https://jira.opensciencegrid.org/browse/SOFTWARE-1678
* https://jira.opensciencegrid.org/browse/SOFTWARE-1679
* Conditional for SEC_CLIENT_AUTHENTICATION_METHODS that we spoke about adding to the condor_ce_client_env_bootstrap.

I'm realizing I probably should've made separate pull requests for each issue...
Carl had this to say about that implementation when I asked him a few months ago:

> the X thing is a way to avoid (on old, bad sh implementations, which do not exist on rhel) the first argument getting interpreted as an option if it starts with a '-'