(#4540)  Fix a crash in the EC2 GAHP if $ENV{USER} isn't set.
Merge branch 'V8_2-branch' into V8_3_1-branch

Conflicts:
	src/condor_tests/job_condorc_ab_van.run
	src/condor_tests/job_condorc_abc_van.run
Merge branch 'V8_3_1-branch'