Factor out some duplication between SVNRunOptions and GitRunOptions.
Patch by: Greg Ward <greg@gerg.ca>
Specifically, extract common code from the two
_get_extraction_options_group() methods.
* cvs2svn_lib/run_options.py: Add methods _add_use_internal_co_option(),
_add_use_cvs_option(), and _add_use_rcs_option() to RunOptions.
* cvs2svn_lib/git_run_options.py: Collapse _get_extraction_options_group().
* cvs2svn_lib/svn_run_options.py: Collapse _get_extraction_options_group().
git-svn-id: http://cvs2svn.tigris.org/svn/cvs2svn/trunk@4906 be7e6eca-30d4-0310-a8e5-ac0d63af7087