TT#18774 Do not check sysv related packages till mr7.0

We cannot purge some packages during migration sysv->systemd on
upgrade mr6.1->mr6.2, otherwise the final command 'reboot' will
not work as expected. It commit here can be reverted in mr7.0+.
It cannot be reverted earlier, otherwise LTS upgrade will report
sysv packages availability.

Change-Id: Ib23a046a4fae50834eddc9568f2051b556f0dcaf

templates/310_package-ngcp.yaml.tt2

@@ -35,17 +35,19 @@ package:
   systemd-shim:
     installed: false
 
-  insserv:
-    installed: [% general.init_system == 'sysv' ? 'true' : 'false' %]
-
-  startpar:
-    installed: [% general.init_system == 'sysv' ? 'true' : 'false' %]
-
-  initscripts:
-    installed: [% general.init_system == 'sysv' ? 'true' : 'false' %]
-
-  sysv-rc:
-    installed: [% general.init_system == 'sysv' ? 'true' : 'false' %]
+# Disabled till mr7.0 as the packages will be available after LTS upgrade mr5.5->mr6.5
+# (see the discussion in https://gerrit.mgm.sipwise.com/#/c/19275/ for more details)
+#  insserv:
+#    installed: [% general.init_system == 'sysv' ? 'true' : 'false' %]
+#
+#  startpar:
+#    installed: [% general.init_system == 'sysv' ? 'true' : 'false' %]
+#
+#  initscripts:
+#    installed: [% general.init_system == 'sysv' ? 'true' : 'false' %]
+#
+#  sysv-rc:
+#    installed: [% general.init_system == 'sysv' ? 'true' : 'false' %]
 
   sysvinit-core:
     installed: [% general.init_system == 'sysv' ? 'true' : 'false' %]