Fixed key generation

- generate before running check_mk on the sshd_config
- set permissions on private key
- cope with empty keys

openssh/config.sls

 {%-     endif %}
 ssh_generate_host_{{ keyType }}_key:
   cmd.run:
-    {%- if keySize %}
-    - name: ssh-keygen -t {{ keyType }} -b {{ keySize }} -N '' -f {{ keyFile }}
-    {%- else %}
-    - name: ssh-keygen -t {{ keyType }} -N '' -f {{ keyFile }}
-    {%- endif %}
-    - creates: {{ keyFile }}
+    {%- set keySizePart = "-b {}".format(keySize) if keySize else "" %}
+    - name: "rm {{ keyFile }}*; ssh-keygen -t {{ keyType }} {{ keySizePart }} -N '' -f {{ keyFile }}"
+    - unless: "test -s {{ keyFile }}"
     - user: root
+    - require_in:
+      - file: sshd_config
     - watch_in:
       - service: {{ openssh.service }}
 
+ssh_host_{{ keyType }}_key:  # set permissions
+  file.managed:
+    - name: {{ keyFile }}
+    - replace: false
+    - mode: 0600
+    - require:
+      - cmd: ssh_generate_host_{{ keyType }}_key
+    - require_in:
+      - file: sshd_config
+
 {%-   elif salt['pillar.get']('openssh:absent_' ~ keyType ~ '_keys', False) %}
 ssh_host_{{ keyType }}_key:
   file.absent:
     - contents_pillar: 'openssh:{{ keyType }}:private_key'
     - user: root
     - mode: 600
+    - require_in:
+      - file: sshd_config
     - watch_in:
       - service: {{ openssh.service }}
 
     - contents_pillar: 'openssh:{{ keyType }}:public_key'
     - user: root
     - mode: 600
+    - require_in:
+      - file: sshd_config
     - watch_in:
       - service: {{ openssh.service }}
 {%-   endif %}
   file.directory:
     - user: root
     - mode: 755
+    - require_in:
+      - file: sshd_config
     - watch_in:
       - service: {{ openssh.service }}
 {% endif %}