enable reading *.ad files from execution directory

1) enable reading *.ad files from execution directory and extract
key/value pairs, substitute all env variables in $command_start, in
which parameters are extract from the vmconf file.
2) extract parameters in key/value pairs from each line in vmconf file,
but only split on the first "=",
log file names changed

1) each site produces different condor_vm_rocks log files.
2) added a dag test script