- Fixed regression introduced in 890 when "fixing warnings" for target_call_timer_callbacks_now().
target_call_timer_callbacks_now() did the same as target_call_timer_callbacks().

- Reduced keep_alive()'s job to only deal with GDB keep  alive problems.

git-svn-id: svn://svn.berlios.de/openocd/trunk@985 b42882b7-edfa-0310-969c-e2dbd0fdcd60