[Reviewer Andy] Change to use soft asserts in PJSIP

Andy

Can you review this change to PJSIP config_site file to change to use soft asserts.  I've tested by hacking in a failing pj_assert to sprout's start-up code immediately after the call to pj_init(), where I get the following output, proving that it carried on after the assert.

Mike

```
25-10-2013 21:24:23.648 Error pjsip: Assert failed: stack.cpp:593 status == PJ_SUCCESS
25-10-2013 21:24:23.824 Status stack.cpp:513: Listening on port 5054
25-10-2013 21:24:23.824 Status stack.cpp:773: Local host aliases:
25-10-2013 21:24:23.824 Status stack.cpp:778:  10.144.9.222
25-10-2013 21:24:23.824 Status stack.cpp:778:  sprout.me3.cw-ngv.com
25-10-2013 21:24:23.824 Status stack.cpp:778:  10.144.9.222
25-10-2013 21:24:23.824 Status stack.cpp:778:  sprout.me3.cw-ngv.com
```