Fix bad file descriptor leak in the ft-gahp. #3559

A pipe was leaked on every UPLOAD_SANDBOX and DESTROY_SANDBOX command.
ft-gahp: return failure when creating child process fails. #3559

Otherwise, the gridmanager will wait for the command to finish.
Add support for RequestMemory to the blahp. #3398

Allow users of the blahp to specify the amount of memory required by the
job, using the same attribute as for HTCondor job ads. This number (in
megabytes) is passed to the submit scripts via the new -m parameter. The
PBS and Condor scripts now use it in the job submission. The other
submit scripts don't use it yet.
Update URLs in bosco_findplatform to bosco-1.2
Add BATCH_GAHP_CHECK_STATUS_ATTEMPTS parameter for INFN jobs. #3533

BATCH_GAHP_CHECK_STATUS_ATTEMPTS allows the INFN job manager to
be resilliant to failures in job status checks.  The configuration
option is an integer describing the number of failed attempts
allowed before putting the job on hold.