Updated contribs/cray/libalps tests

updated drop-in replacement of the contribs/cray libalps test programs.
 * up-to-date updates of libalps (in synch with slurm's libalps)
 * support for Accelerators
 * alps_tests/reassemble_inventory and
 * alps_tests/test_reservation now have accelerator support
 * the latter implements the key/value format for passing parameters
   to e.g. the gres/gpu plugin (but here it is just a dumb test program).
Patch from Gerrit Renker and Stphen Trofinoff, CSCS.