Finish linux:system:user:sudo parametrization

Change-Id: Idf650767d379603853d5f4691c13cf37f2b7645f
diff --git a/openssh/server/team/members/matthewroark.yml b/openssh/server/team/members/matthewroark.yml
index 97064db..3dc01a6 100644
--- a/openssh/server/team/members/matthewroark.yml
+++ b/openssh/server/team/members/matthewroark.yml
@@ -5,7 +5,7 @@
         mroark:
           enabled: true
           name: mroark
-          sudo: false
+          sudo: ${_param:linux_system_user_sudo}
           full_name: Matthew Roark
           home: /home/mroark
           email: mroark@mirantis.com