Add error handling when cleaning up resources

It is possible for a single provider to have problems (eg: auth) which
blocks all other providers behind it. This causes a problem as leaked
instances could never be cleaned up in providers that are working.

Change-Id: I97d05815ae4812ba9e2881e1207ee901d269e655
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

nodepool/launcher.py

@@ -527,7 +527,12 @@ class CleanupWorker(BaseCleanupWorker):
         for provider in self._nodepool.config.providers.values():
             manager = self._nodepool.getProviderManager(provider.name)
             if manager:
-                manager.cleanupLeakedResources()
+                try:
+                    manager.cleanupLeakedResources()
+                except Exception:
+                    self.log.exception(
+                        "Failure during resource cleanup for provider %s",
+                        provider.name)
 
     def _cleanupMaxReadyAge(self):
         '''