postinst's parsing of mailman3-web.py is brittle

[Paul Collins]

The postinst script parses mailman3-web.py with sed, and relies on the "ADMIN" value looking like this:

ADMINS = (
     ('Mailman Suite Admin', '<email address hidden>'),
)

i.e. a) "Mailman Suite Admin" must be present and b) the closing paren must be left-aligned.

The mailman3-web charm writes the file in the following perfectly valid Python:

ADMINS = (
    ('Mailman Web Admin', '<email address hidden>'),
    )

but which violates a) (wrong text) and b) (closing paren is indented).

We can fix this particular point in the charm but ideally the package would be able to cope with any valid Python syntax.

[Paul Collins (pjdc)]

We've landed a change in mailman3-web-charm that avoids these parsing problems.