Improve routed job environment configuration, simplify APEL configuration

New features include:

• Add non-OSG method for modifying the job environment (https://opensciencegrid.atlassian.net/browse/SOFTWARE-3871)
• Simplify configuration of APEL scripts (#250)

Bug fixes include:

• Fix an issue where condor_ce_q required authentication (https://opensciencegrid.atlassian.net/browse/SOFTWARE-3860, #262)
• Re-enable the ability for local users to submit jobs to the CE queue (https://opensciencegrid.atlassian.net/browse/SOFTWARE-3856, #257)
• Fix the ability to specify grid certificate locations for SSL authentication (#253)
• Refine the APEL record filter to ignore jobs that have not yet started (#271)
• Fix an issue where some jobs were capped at 72 minutes instead of 72 hours (#269)
• Add systemctl daemon-reload to packaging for initial installations (#252)
• Improve robustness of BDII provider (#247, #254, #255)