MT#17699 Bump Standards-Version to 3.9.7

No further changes required to update to Debian Policy 3.9.7[.0]

Change-Id: Id83a1ffd3a4128a342ab2229b5bf3be0dadfb54e

debian/control

@@ -3,7 +3,7 @@ Section: net
 Priority: extra
 Maintainer: Sipwise Development Team <support@sipwise.com>
 Build-Depends: debhelper (>= 8)
-Standards-Version: 3.9.6
+Standards-Version: 3.9.7
 Homepage: http://sipwise.com/
 
 Package: ngrep-sip