config API: read only specific files from schemaplugindir Currently the config API read any file in the schema plugin dir, typically /usr/share/sssd/sssd.api.d. If there are any unexpected files, like e.g. editor copies or backups, the python code might break because it cannot parse the files. With this patch only files matching the pattern '^sssd-.*\.conf$' are read from this directory. Additionally this patch contains a file which will break the config API self test if it is not filtered out correctly. Reviewed-by: Stephen Gallagher <sgallagh@redhat.com>