Cal's GridFTP Tests

Check that a GridFTP server works by transfering files to and from the
local machine.  Also checks third-party transfers by transfering files
between each pair of remote servers.

For local->machine the three checks are:
 Step  1) local->machine
 Step  2) machine->local
 Step  3) check that contents are correct

For machine1->machine2 the three checks are:
 Step  1) machine1->machine2
 Step  2) machine2->local
 Step  3) check that contents are correct


Steps 1 to 3 are for Transfers to/from "/tmp" directory on remote node,
while
Steps 4 to 6 are for Transfers to/from USER's HOME directory on remote node.