nss: Adjust tests to use nss_files only

ChangeLog

@@ -1,3 +1,9 @@
+2018-01-30  Florian Weimer  <fweimer@redhat.com>
+
+	* nss/bug17079.c (do_test): Use nss_files only for reading passwd
+	data.
+	* nss/tst-nss-getpwent.c (do_test): Likewise.
+
 2018-01-30  Rafal Luzynski  <digitalfreak@lingonborough.com>
 
 	[BZ #10871]

nss/bug17079.c

@@ -17,6 +17,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <errno.h>
+#include <nss.h>
 #include <pwd.h>
 #include <stdbool.h>
 #include <stdio.h>
@@ -213,6 +214,8 @@ test_buffer_size (size_t buffer_size)
 int
 do_test (void)
 {
+  __nss_configure_lookup ("passwd", "files");
+
   if (!init_test_items ())
     return 1;
   printf ("info: %d test items\n", test_count);

nss/tst-nss-getpwent.c

@@ -15,6 +15,7 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+#include <nss.h>
 #include <pwd.h>
 #include <stdbool.h>
 #include <stdio.h>
@@ -26,6 +27,8 @@
 int
 do_test (void)
 {
+  __nss_configure_lookup ("passwd", "files");
+
   /* Count the number of entries in the password database, and fetch
      data from the first and last entries.  */
   size_t count = 0;