Tell stevedore not to force verify requirements

Disable the strict requirements checking in pkg_resources by telling
stevedore to bypass it. This avoids issues with devstack configurations
where the "wrong" version of a library is installed, even though it is
functional.

Closes-Bug: #1454572
Change-Id: Idbdbdd2548ad39325d8058eb19ee398f732c2e44

heat/engine/clients/__init__.py

@@ -156,4 +156,4 @@ def initialise():
     _mgr = extension.ExtensionManager(
         namespace='heat.clients',
         invoke_on_load=False,
-        verify_requirements=True)
+        verify_requirements=False)

heat/engine/resources/__init__.py

@@ -38,7 +38,7 @@ def _get_mapping(namespace):
     mgr = extension.ExtensionManager(
         namespace=namespace,
         invoke_on_load=False,
-        verify_requirements=True)
+        verify_requirements=False)
     return [[name, mgr[name].plugin] for name in mgr.names()]
 
 

heat/engine/template.py

@@ -52,7 +52,7 @@ def _get_template_extension_manager():
     return extension.ExtensionManager(
         namespace='heat.templates',
         invoke_on_load=False,
-        verify_requirements=True,
+        verify_requirements=False,
         on_load_failure_callback=raise_extension_exception)