(merge from 3.0)

(merge from 3.0)

Make more functions static, and remove duplication in the use of functions
in lib/smbpasswd.c that were exact duplicates of functions in passdb/passdb.c

(These should perhaps be pulled back out to smbpasswd.c, but that can occour
later).

This also includes some >14 character password changes, and the start
of a move away from using 'admin user' to determine if the user is
root (as root can login without setting 'admin user').

Andrew Bartlett