Nova add context switch chance to other threads

Cherry pick of potential fix for nova service rabbit connection issues:
https://review.opendev.org/c/openstack/nova/+/938215

Author: darmach

etc/kayobe/kolla.yml

@@ -151,6 +151,10 @@ kolla_sources:
     type: git
     location: https://github.com/stackhpc/networking-mlnx
     reference: stackhpc/{{ openstack_release }}
+  nova-compute:
+    type: git
+    location: https://github.com/stackhpc/nova
+    reference: nova-flap-testfix
   nova-compute-plugin-networking-mlnx:
     type: git
     location: https://github.com/stackhpc/networking-mlnx