TT#22072 Update packaging

- Bump debhelper compatibility version 10.
- Switch from Priority extra to optional.
- Update debian/.gitignore file.

Change-Id: If2e0f59104735b2d2f1fbc481bf785848ae471f6

debian/.gitignore

@@ -1,5 +1,7 @@
 *.log
 *.substvars
+*.debhelper
+/.debhelper/
 /debhelper-build-stamp
 /files
 /ngcp-system-tests/

debian/compat

@@ -1 +1 @@
-9
+10

debian/control

@@ -1,9 +1,9 @@
 Source: ngcp-system-tests
 Section: admin
-Priority: extra
+Priority: optional
 Maintainer: Sipwise Development Team <support@sipwise.com>
 Build-Depends:
- debhelper (>= 9),
+ debhelper (>= 10),
 Standards-Version: 3.9.8
 Homepage: https://www.sipwise.com/