Rejoin args list into a string for run_command when using an unsafe shell

This allows the use of an args list with leading environment variables,
which otherwise would fail due to the way Popen works.

lib/ansible/module_utils/basic.py

@@ -1008,7 +1008,9 @@ class AnsibleModule(object):
 
         shell = False
         if isinstance(args, list):
-            pass
+            if use_unsafe_shell:
+                args = " ".join([pipes.quote(x) for x in args])
+                shell = True
         elif isinstance(args, basestring) and use_unsafe_shell:
             shell = True
         elif isinstance(args, basestring):