Only allow privileged exec_create for API version >= 1.19

Author: shin-

docker/client.py

@@ -531,10 +531,14 @@ def execute(self, container, cmd, detach=False, stdout=True, stderr=True,
 
         return self.exec_start(create_res, detach, tty, stream)
 
-    def exec_create(self, container, cmd, stdout=True,
-                    stderr=True, tty=False, privileged=False):
+    def exec_create(self, container, cmd, stdout=True, stderr=True, tty=False,
+                    privileged=False):
         if utils.compare_version('1.15', self._version) < 0:
             raise errors.InvalidVersion('Exec is not supported in API < 1.15')
+        if privileged and utils.compare_version('1.19', self._version) < 0:
+            raise errors.InvalidVersion(
+                'Privileged exec is not supported in API < 1.19'
+            )
         if isinstance(container, dict):
             container = container.get('Id')
         if isinstance(cmd, six.string_types):