Fix failing SIP unit test

Per LP# 1099595, just copy the constant inline instead of requiring the
SIPServer code to be installed on every instance where you don't want
'make check' to fail. (Skipping the test in the absence of the SIPServer
code would be another option, but then you're skipping the test, and for
the sake of 1 constant, that seems like a bad trade.)

Signed-off-by: Dan Scott <dan@coffeecode.net>
Signed-off-by: Mike Rylander <mrylander@gmail.com>