test: Fix random jenkins-other tests failures

- ext pipe test should build binar
- criu no longer accepts "extra" empty arguments
- adduser doesn't add more than one same user

All this came unnoticed due to error in tests failure detection
(36a13cbd test: don't ignore errors other other tests)
Signed-off-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/pipes/Makefile

@@ -2,7 +2,7 @@ CFLAGS += -Wall
 pipe: pipe.c
 clean:
 	rm -f pipe
-run:
+run: pipe
 	./pipe - &&		\
 	./pipe -c &&		\
 	./pipe -cl &&		\

test/pipes/pipe.c

@@ -456,8 +456,13 @@ void restore_child(int *new_pipefd, char *old_pipe_name)
 					"%s", INHERIT_FD_OPTION);
 				snprintf(inh_file_arg, sizeof inh_file_arg,
 					"fd[%d]:%s", filefd, OLD_LOG_FILE + 1);
-			}
-		}
+
+				restore_argv[13] = inh_file_opt;
+			} else
+				restore_argv[13] = NULL;
+			restore_argv[11] = inh_pipe_opt;
+		} else
+			restore_argv[11] = NULL;
 
 		snprintf(buf, sizeof buf, "%s/%s", IMG_DIR, RESTORE_PID_FILE);
 		unlink_safe(buf);

test/security/Makefile

@@ -22,6 +22,8 @@ testdir: ../../criu
 	chmod 777 $(DIR)
 
 users:
+	-userdel -f $(USR1)
+	-userdel -f $(USR2)
 	useradd -M -U $(USR1)
 	useradd -M -U $(USR2)
 	usermod -a -G $(USR2) $(USR1)