[TD-307]

While initialize timer module, tmrCtrls is constructed to be a free
list. However, the last tmrCtrls is never initialized, which is
allocated from malloc(). Since the code relies on tmrCtrls->next
to tell if there's any free tmrCtrls left, the last tmrCtrls should
be properly linked to NULL.

for rpc, set the link as secured for success response before sending response

remove two unsed fields in tsclient.h