selftest: Run test of how userPassword / crypt() style passwords are stored in quicktest

selftest: Run test of how userPassword / crypt() style passwords are stored in quicktest

This ensures that the crypt_r()/crypt_rn()/crypt() behaviour is tested in all
the samba-o3 builds and so is checked on RHEL7 in GitLab CI.

https://bugzilla.samba.org/show_bug.cgi?id=14424

Signed-off-by: Andrew Bartlett <abartlet@samba.org>
Reviewed-by: Alexander Bokovoy <ab@samba.org>
(cherry picked from commit cabf873b75b1d4d456190358bc3ed051bca16978)

Autobuild-User(v4-11-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-11-test): Mon Jul  6 15:10:27 UTC 2020 on sn-devel-184