pam_unix: Add logging useful for debugging problems

Two messages added about obtaining the username are guarded
by the debug option as these should not be normally
logged - they can be useful for debugging but they do not
indicate any special condition.

The message about authenticating user with blank password is
still just LOG_DEBUG priority but it is logged unconditionally
because it is somewhat extraordinary condition to have an user
with blank password.

* modules/pam_unix/pam_unix_auth.c (pam_sm_authenticate): Replace
  D() macro calls which are not enabled on production builds with
  regular pam_syslog() calls.

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