Fix namespace handler to preinstall linux.system.pkgs

Change-Id: I22e512e3dcebea3bd5bc1ada08bf2e3c0e6f9250

linux/system/apparmor.sls

@@ -10,7 +10,7 @@ apparmor_service:
   - name: apparmor
   - enable: true
   - require:
-    - pkg: linux_packages
+    - pkg: linux_repo_prereq_pkgs
 
 {%- else %}