Fix errors in lookup plugins.

Lookup plugins 'sequence' and 'template' now import 'ansible.utils'
appropriately in order to use the 'listify_lookup_plugin_terms'
function.

Also, 'dnstxt' and 'env' now check to see if 'terms' is a string;
without this calls like '{{ lookup('env', 'HOME') }}' fail.

lib/ansible/runner/lookup_plugins/sequence.py

@@ -16,7 +16,7 @@
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 
 from ansible.errors import AnsibleError
-from ansible.utils import parse_kv
+import ansible.utils as utils
 from re import compile as re_compile, IGNORECASE
 
 # shortcut format
@@ -181,7 +181,7 @@ class LookupModule(object):
 
                 try:
                     if not self.parse_simple_args(term):
-                        self.parse_kv_args(parse_kv(term))
+                        self.parse_kv_args(utils.parse_kv(term))
                 except Exception:
                     raise AnsibleError(
                         "unknown error parsing with_sequence arguments: %r"