quilt mail: Allow commas in Signed-off-by and Acked-by lines

The standard quilt_mail_patch_filter() in quilt mail tries to extract email
addresses from Signed-off-by and Acked-by lines.  It adds Cc headers with those
addresses.

Signed-off-by and Acked-by lines sometimes contain commas as part of the
address.  When put in recipient headers (To, Cc, Bcc), the commas are
interpreted as separators, which breaks things.

Try to recognize this case and add the appropriate quotes.  For example, the
email address in ``Signed-off-by: Gruenbacher, Andreas <agruen@linbit.com>'' is
now extracted as ``"Gruenbacher, Andreas" <agruen@linbit.com>''.

Note that quilt_mail_patch_filter() can be overridden in .quiltrc; you may need
to update your .quiltrc.

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