Overhauled regression test suite.
Added various command line tests.
Enhanced test suite to allow entries in the test data file to specify
alternate user and workspaces (differing from defaults defined in
the test test configuration files, test_cbd.*.cfg) for certain
tests.
Added new testing method, broker input testing, to augment existing
command line testing.
This test method simulates having 'p4d' call the CBD broker sync
script by feeding handcrafted/simulated broker input files to the CBD
engine, simulating the way p4d uses stdin to feed the broker
parameters when a user makes a request.
This enables more diverse testing and better simulation of Window
and P4V-side testing.