Use items() method to loop over nodegroups/log_granular_levels dictionaries

Otherwise you get an “ValueError: too many values to unpack” exception
when you make use of those entries in your pillar data.

salt/files/master.d/_defaults.conf

 #
 {% if 'log_granular_levels' in master %}
 log_granular_levels:
-  {% for name, lvl in master['log_granular_levels'] %}
+  {% for name, lvl in master['log_granular_levels'].items() %}
   {{ name }}: {{ lvl }}
   {% endfor %}
 {% elif 'log_granular_levels' in salt %}
 log_granular_levels:
-  {% for name, lvl in salt['log_granular_levels'] %}
+  {% for name, lvl in salt['log_granular_levels'].items() %}
   {{ name }}: {{ lvl }}
   {% endfor %}
 {% else %}
 #  group2: 'G@os:Debian and foo.domain.com'
 {% if 'nodegroups' in master %}
 nodegroups:
-  {% for name, lvl in master['nodegroups'] %}
+  {% for name, lvl in master['nodegroups'].items() %}
   {{ name }}: {{ lvl }}
   {% endfor %}
 {% elif 'nodegroups' in salt %}
 nodegroups:
-  {% for name, lvl in salt['nodegroups'] %}
+  {% for name, lvl in salt['nodegroups'].items() %}
   {{ name }}: {{ lvl }}
   {% endfor %}
 {% endif %}