Unhardcode parameters for rocky and queens

timeout_nbd and heal_instance_info_cache_interval were available
for configuration in pike so should be available and in later
releases.

Change-Id: I3bf9bcde5f60761826926d5a6e00893980925681
Related-Prod: https://mirantis.jira.com/browse/PROD-27288
diff --git a/tests/pillar/compute_single.sls b/tests/pillar/compute_single.sls
index c2b740a..5677ab6 100644
--- a/tests/pillar/compute_single.sls
+++ b/tests/pillar/compute_single.sls
@@ -2,6 +2,7 @@
   compute:
     version: newton
     enabled: true
+    timeout_nbd: 10
     heal_instance_info_cache_interval: 60
     vncproxy_url: openstack:6080
     vnc_keymap: en-gb