Relevant BUGIDs:pam_unix_ref_branch

Purpose of commit: new feature

Commit summary:
---------------
        * modules/pam_unix/Makefile.am: Add unix_update helper.
        * modules/pam_unix/pam_unix_passwd.c: Move functions i64c(),
        crypt_md5_wrapper(), save_old_password(), _update_passwd() and
        _update_shadow() to passverify.c file. Rename _unix_run_shadow_binary()
        to _unix_run_update_binary(), which also verifies old password and
        does all writing.
        (_do_setpass, pam_sm_chauthtok): lckpwdf()->lock_pwdf(), the same for unlock.
        Call _unix_run_update_binary() appropriately.
        _update_passwd()->unix_update_passwd(), the same for shadow.
        * modules/pam_unix/passverify.c: Add new functions moved from
        pam_unix_passwd.c and unix_chkpwd.c.
        * modules/pam_unix/passverify.h: Likewise.
        * modules/pam_unix/unix_chkpwd.c: Remove SELinux checks. Move
        su_sighandler(), setup_signals(), getuidname() to passverify.c.
        (main): Remove 'shadow' option. Refactor out read_passwords() and
        call it. More strict checking how the binary is called.
        * modules/pam_unix/unix_update.c: New helper binary - non-setuid,
        called from SELinux confined apps only.

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