When using `compat' mode, be sure to re-dispatch setpwent, endpwent,
setgrent, and endgrent also. (The previous NSS implementation used to
simply twiddle the internal data of the various modules directly.)

A symptom (group list set incorrectly in sshd) was
Reported by: Glenn Johnson <gjohnson@srrc.ars.usda.gov>

Sponsored by: DARPA, Network Associates Laboratories