* Address pylint warnings and errors

- Fix whitespace and indentation
- Remove unused variables
- Fix syntax errors
Signed-off-by: NMarbin Tan <mtan@pivotal.io>

Make consistent with:
https://github.com/greenplum-db/gpdb/commit/d7e6e0ecac5c49d16c68fcb827a23b0116d07b5aSigned-off-by: NChumki Roy <croy@pivotal.io>
Signed-off-by: NC.J. Jameson <cjameson@pivotal.io>

Signed-off-by: NC.J. Jameson <cjameson@pivotal.io>

This removes all utilities which are known to be deprecated from
gpMgmt and it also clears out any command line switches marked as
deprecated along with code marked deprecated. It also removes the
leftovers from previously removed utilities such as gpsuspend and
gpcheck_hostdump etc and fixes mentions of renamed utilities.

There should be no functional change from this commit as the only
removed utils have been marked deprecated for some time.

* fix gpexpand Worker-thread hang problem
When using python 2.7, gpexpand will hang when the command "gpexpand -D gpadmin" is done. sys.exit calls thread.join() which waits for each thread to exit; The sub-thread Worker will still try getting from the WorkerPool Queue. 

however, when using python 2.6.2, it's OK. Maybe the Python threading module changed somehow.

* Changes in gpexpand:
- Explicitly close the connection to the database before trying to stop
  it. Otherwise the database wouldn't stop due to active connection and
  the script will fail.
- Close the connection to the database before leaving the script.
  Otherwise it will not return to the command line