Need --help, --list options and TestSute::testcase args for test_support.run_unittest


User story:
I am covering CGIHTTPServer with tests according to http://www.rfc-editor.org/rfc/rfc3875.txt speccy and want to run a single test in a cycle. I am running test cases like:

> python test_httpservers.py

I want to get all available tests in file and execute only the one, but test_support.run_unittest doesn't accept any params.

> python test_httpservers.py --help

just runs all the tests.


I propose to:

1. add list option
-l, --list    list the names of test to be executed and exit

> python test_httpservers.py --list
BaseHTTPServer::command
BaseHTTPServer::handler
CGIHTTPServerTestCase::authorization

I omit `test_` prefix and `TestCase` suffixes as they don't hold any value and just clutter the console. My idealistic vision thinks it is better this way.

2. add arguments of test names with wildcards
> python test_httpservers.py --list BaseHTTP*
BaseHTTPServer::command
BaseHTTPServer::handler
> python test_httpservers.py --list *auth*
CGIHTTPServerTestCase::authorization

3. The final goal is to be able to run single test as:
> python test_httpservers.py BaseHTTPServer::handler
CGIHTTPServer::url_collapse_path_split ... ok

This format will allow to copy/paste single test name for easy execution, which is impossible with current format:
test_url_collapse_path_split (__main__.CGIHTTPServerTestCase) ... ok


One step to make stdlib module debug more intuitive.