Back port Python 2.5 compatibility changes to Mailman 2.1. Specifically,

- In SecurityManager.py, fix the parsecookie() code to work with Python 2.5
  generated cookie text.  The latter was changed to be more RFC compliant so
  it does not output trailing semicolons for each line of cookie text.  This
  broke the splitting rules, so now first split on newlines, then on ';\s*'.
  This should work across all Python versions.

- In Python 2.5, exceptions are new-style, and thus are no longer of
  ClassType.  The instantiation type test in hold_for_approval() was too
  naive.  This one is fixed differently here than in the MM trunk because in
  Python 2.1, 'type' isn't a type, it's a function and so can't be used as the
  second argument to isinstance() directly.

- Raising strings generates deprecation warnings in Python 2.5.  Switch the
  one weird use of this in Utils.py to use a class exception.  Don't call it
  "quick exit" though because it's probably not.

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