Add get_options function to test Util module

Future tests that need to check for the presence of all
options (ex. in the output of --help) should use this function.
Add test for --man output
Add missing options to --man output
Change --line to --lines in --man output

The option is technically --lines, so we're documenting that.
--line should probably be documented as well in the future
Add options we missed to test options list
Add --man output for --dump and --ignore-ack-defaults