When running the PJSIP AMI "show_endpoint" test with automatic
conversion to realtime, the test would fail. This was because the AOR
"contact" column was sized at 40, and the configured contact was larger
than that.
This commit increases the size of the contact column to 255 characters.
Change-Id: Ia65bc7fd37699b7c0eaef9629a1a31eab9a24ba1