fix up sanity tests and with_modules conditional

Signed-off-by: Adam Miller <admiller@redhat.com>

lib/ansible/modules/packaging/os/dnf.py

@@ -257,17 +257,17 @@ EXAMPLES = '''
 
 - name: install a modularity appstream with defined stream and profile
   dnf:
-    name: @postgresql:9.6/client
+    name: '@postgresql:9.6/client'
     state: present
 
 - name: install a modularity appstream with defined stream
   dnf:
-    name: @postgresql:9.6
+    name: '@postgresql:9.6'
     state: present
 
 - name: install a modularity appstream with defined profile
   dnf:
-    name: @postgresql/client
+    name: '@postgresql/client'
     state: present
 '''
 
@@ -764,6 +764,7 @@ class DnfModule(YumDnf):
                 if env:
                     env_specs.append(env.id)
 
+                if self.with_modules:
                     mdl = self.module_base._get_modules(grp_env_mdl_candidate)
                     if mdl[0]:
                         module_specs.append(grp_env_mdl_candidate)