pillar: add empty pillar and pillarstack config

Prevents the following warnings/errors in the master log:

    [ERROR   ] Root path 'pillar' not present in git_pillar remote '__env__ https://git.spritsail.io/frebib/salt.git', skipping.
    [ERROR   ] Root path 'pillar' not present in git_pillar remote '__env__ https://github.com/nerdhouse/salt.git', skipping.
    [CRITICAL] Specified ext_pillar interface gitstack is unavailable

Signed-off-by: Joe Groocock <me@frebib.net>

pillar/top.sls

@@ -0,0 +1,3 @@
+{{ saltenv }}:
+  '*':
+    []

stack/stack.cfg

@@ -0,0 +1 @@
+[]

states/salt/minion/init.sls

@@ -11,10 +11,10 @@ salt-minion:
 
 restart-salt-minion:
   cmd.run:
-  - name: "sleep 10 && systemctl restart salt-minion --no-block"
+  - name: sleep 10 && systemctl restart salt-minion
   - bg: true
   - order: last
-  - watch:
+  - onchanges:
     - pkg: salt-minion
     - file: /etc/salt/minion
   - require:
@@ -34,6 +34,7 @@ restart-salt-minion:
 
 check-minion-config:
   cmd.run:
-  - name: sudo salt-call --local --skip-grains test.ping
+  - name: sudo salt-call --local --skip-grains test.true
-  - watch:
+  - onchanges:
+    - pkg: salt-minion
     - file: /etc/salt/minion