Add shade version check to os_flavor_facts

The range_search() API was added to the shade library in version
1.5.0 so let's check for that and let the user know they need to
upgrade if they try to use it.

cloud/openstack/os_flavor_facts.py

@@ -23,6 +23,9 @@ try:
 except ImportError:
     HAS_SHADE = False
 
+from distutils.version import StrictVersion
+
+
 DOCUMENTATION = '''
 ---
 module: os_flavor_facts
@@ -200,6 +203,9 @@ def main():
             if ram:
                 filters['ram'] = ram
             if filters:
+                # Range search added in 1.5.0
+                if StrictVersion(shade.__version__) < StrictVersion('1.5.0'):
+                    module.fail_json(msg="Shade >= 1.5.0 needed for this functionality")
                 flavors = cloud.range_search(flavors, filters)
 
         if limit is not None: