Unquote params passed to an include statement

Fixes #8315

lib/ansible/playbook/play.py

@@ -573,6 +573,7 @@ class Play(object):
                 mv = task_vars.copy()
                 for t in tokens[1:]:
                     (k,v) = t.split("=", 1)
+                    v = utils.splitter.unquote(v)
                     mv[k] = template(self.basedir, v, mv)
                 dirname = self.basedir
                 if original_file:

test/integration/roles/test_good_parsing/tasks/main.yml

@@ -121,3 +121,7 @@
   include: test_include.yml param={{ test_input }}
   register: result
 
+- name: test includes with quoted params
+  include: test_include.yml param="this is a param"
+  register: result
+