Split APItest/t/handy.t

Split APItest/t/handy.t

This is a very long running test.  This commit splits it into smaller
chunks, based on the environment variable TEST_JOBS, up to 10.   Each
chunk executes 1/TEST_JOBS of the total test.  If TEST_JOBS is not set,
it reverts to 1 chunk.  The alternative would be to revert to 10, but
since there is overhead associated with each new chunk, I chose, for
now, 1.

There may be a better solution later on, but I think this is good enough
for now.