zdtm: Pick up deleted unix socket test (v2)

CRIU doesn't support relative unix sockets paths, so
tune the test to use absolute.

(v2: Off-by-one spotted by Filipe)
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

test/zdtm.sh

@@ -59,6 +59,7 @@ static/sock_opts01
 static/sockets_spair
 static/sockets_dgram
 static/socket_queues
+static/deleted_unix_sock
 static/sk-unix-unconn
 static/pid00
 static/pstree

test/zdtm/live/static/deleted_unix_sock.c

+#define _GNU_SOURCE
 #include <errno.h>
 #include <unistd.h>
 #include <stdlib.h>
@@ -19,11 +20,14 @@ TEST_OPTION(filename, string, "file name", 1);
 
 static int fill_sock_name(struct sockaddr_un *name, const char *filename)
 {
-	if (strlen(filename) >= sizeof(name->sun_path))
+	char *cwd;
+
+	cwd = get_current_dir_name();
+	if (strlen(filename) + strlen(cwd) + 1 >= sizeof(name->sun_path))
 		return -1;
 
 	name->sun_family = AF_LOCAL;
-	strcpy(name->sun_path, filename);
+	sprintf(name->sun_path, "%s/%s", cwd, filename);
 	return 0;
 }