Add remaining tests for 'command check' and 'command cance'
Add tests for 'hivecmd submit'
Add tests for 'prestocmd submit'
Fix bug in hadoopcmd parsing introduced in e22b3ee.

OptionParser introduced in e22b3ee was preventing commands like:
qds.py hadoopcmd submit s3distcp --src source --dest destincation
from working as they were erroring out because --src etc. are not
known to optparser.
Add tests for 'hadoopcmd submit'
Add test stubs for other command types
Merge pull request #51 from mindprince/tests-command-api

More tests for command api.