TT#88050 Add ngcp-addons virtual packages

Adding a Conflicts/Provides/Replaces on ngcp-addons makes these
metapackages not coinstallable, which is what we want here.

Change-Id: Ie6036b93929eed54a854d2e705f452a35316dcce

debian/control

@@ -157,10 +157,13 @@ Description: Metapackage for Sipwise's NGCP
 Package: ngcp-addons-pro
 Architecture: all
 Conflicts:
+ ngcp-addons,
  ngcp-nth-pro,
 Replaces:
+ ngcp-addons,
  ngcp-nth-pro,
 Provides:
+ ngcp-addons,
  ngcp-nth-pro,
 Depends:
  acpi,
@@ -229,10 +232,13 @@ Description: Metapackage for Add-Ons in NGCP
 Package: ngcp-addons-ce
 Architecture: all
 Conflicts:
+ ngcp-addons,
  ngcp-nth-ce,
 Replaces:
+ ngcp-addons,
  ngcp-nth-ce,
 Provides:
+ ngcp-addons,
  ngcp-nth-ce,
 Depends:
  acpi,