bug: fix traceback in roundup-admin init with bad config values initialize accepts setting values for config.ini file settings. If they are not valid, you got a python traceback. ConfigurationError exceptions are now trapped. The admin.py's usageError_feedback method is used to inform the user. Also the feedback message now starts with a newline making it easier to read by separating it from command that caused the issue.

try:
    # Python 3+
    from http import cookies as Cookie
    from http.cookies import BaseCookie, CookieError, SimpleCookie
    from http.cookies import _getdate as get_cookie_date
except ImportError:
    # ruff: noqa: F401, PLC2701
    # Python 2.5-2.7
    from Cookie import BaseCookie, CookieError, SimpleCookie
    from Cookie import _getdate as get_cookie_date