#163 set/get_slot seems to be broken

[Alan Cabrera]

set/get_slot seems to be broken when I try to use it in
my interceptor. Basically, I set the value in the slot
in receive_request(). When I try to get the value in
send_reply(), the slot seems to be cleared. I looked
in the AbstractServerRequest and it seems that it
clears the values in like 817:

// set the request current table back to the
thread scope current
// discarding any changes made during
recieve_request
m_rs_pi_curr_entry = m_ts_pi_curr_entry;

I believe that m_ts_pi_curr_entry is not properly
initialized.