[Telemetry] Add timeout to telemetry run_tests

tools/telemetry/third_party/subprocess32/testdata/fd_status.py

+"""When called as a script, print a comma-separated list of the open
+file descriptors on stdout."""
+
+import errno
+import os
+import fcntl
+
+try:
+    _MAXFD = os.sysconf("SC_OPEN_MAX")
+except:
+    _MAXFD = 256
+
+def isopen(fd):
+    """Return True if the fd is open, and False otherwise"""
+    try:
+        fcntl.fcntl(fd, fcntl.F_GETFD, 0)
+    except IOError, e:
+        if e.errno == errno.EBADF:
+            return False
+        raise
+    return True
+
+if __name__ == "__main__":
+    print(','.join(str(fd) for fd in range(0, _MAXFD) if isopen(fd)))