Remove the vestiges of the first cut of this code - clt_thr was
being defined locally in clt.c and it wasn't using what was in
thr.h.  Tsk.
* fix the mgr timer event setup to be 100ms, not 10ms.
* print out if we request a HTTP request but we already have one pending.
* free an event that was created if creating a connection fails.
* comments.