ft-gahp was ignoring peer version given by CONDOR_VERSION command. #4473

If the job ad for a given transfer request didn't have a CondorVersion
attribute, then the ft-gahp assumed the peer for the transfer was the same
version as itself.
Merge branch 'V8_2-branch' into V8_3_0-branch
Merge branch 'V8_3_0-branch'