pam_pts.spec: Update package to include man page and better defaults

* Added a man page for pam_pts
* Removed a default configuration file.
  This change was made because we want the default install to allow
  access.  Previously, the configuration set up the path to the
  configuration, but did not add any way to have authorization, which
  meant that all would be denied.  With no file configured, the safest
  failback is set up.