session timeout problem

[Ahmet Basagalar]

In 3.9 release, radius session-timeout is not working if it is longer than 
reauthentication period. Basically, at every reauthentication, session 
timeout is being reset again, so no session-timeout is occuring. In order to 
avoid this, I have modified the following line in ieee802_1x.c

else if (session_timeout_set)

as follows

else if (session_timeout_set && !sta->acct_session_started)

so session_timeout is set if only accounting session is not started.

This seemed to fix the problem, and session-timeouts are working ok. now.