Allow uid/gid names that begin with numbers, as long as it's not completely a number.
Allow uid/gid names that begin with numbers, as long as it's not completely
a number.

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branch : HEAD

jkerihuel/dovecot,jkerihuel/dovecot,jwm/dovecot-notmuch,jkerihuel/dovecot,jkerihuel/dovecot,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jkerihuel/dovecot