Debian 9 npm/nodejs fix

salt/manager/pipeline.sls

-{% if grains['os'] == 'Ubuntu' or grains['os'] == 'Debian' %}
+{% if grains['os'] == 'Debian' and grains['oscodename'] == 'stretch' %}
+{# Debian 9 stretch has no npm. 
+   Using nodesource repo where nodejs package provides npm. #}
+nodesource-repo:
+  pkgrepo.managed:
+    - humanname: Nodesource Repository
+    - name: deb http://deb.nodesource.com/node_6.x stretch main
+    - dist: stretch
+    - file: /etc/apt/sources.list.d/nodesource.list
+#    - key_url: 'https://deb.nodesource.com/gpgkey/nodesource.gpg.key'
+    - keyid: '68576280'
+    - keyserver: keys.gnupg.net
+    - require-in:
+      - pkg: npm
+    - require:
+      - pkg: python-apt
+
+python-apt:
+  pkg.installed
+{% endif %}
+
+{% if grains['os'] == 'Ubuntu' or ( grains['os'] == 'Debian' and grains['oscodename'] != 'stretch' ) %}
 nodejs-legacy:
   pkg.installed
 {% endif %}
 
 npm:
-  {% if grains['os'] == 'Ubuntu' or grains['os'] == 'Debian' %}
+  {% if grains['os'] == 'Debian' and grains['oscodename'] == 'stretch' %}
+  {# nodesource nodejs package has executables node, nodejs, npm #}
+  pkg.installed:
+    - name: nodejs
+  {% elif grains['os'] == 'Ubuntu' or grains['os'] == 'Debian' %}
   pkg.installed:
     - require:
       - pkg: nodejs-legacy