Currently, each DNS test case first checks if DNS is configured
by creating and deleting a test zone. This takes quite a lot of time.
This patch moves the check to the setUpClass method, so the check is
only done once for all the tests.
Similarly, if the server is not available, entire XMLRPC test classes
are now skipped.
Additionally, CLItests that hit the server are skipped if the server
isn't available.
These test that command lines are parsed to correct Command arguments.
Includes some tests for interactive prompts.
To make this possible cli.run is broken up into several pieces.
Petr Viktorin