opencontrail: call installBackup directly

In case cassandra backup schedule is enabled at
the model level, configuring backups before all
computes are deployed will break deployment.
This patch comes in a bundle with a change in
mk/pipeline-library that removes installBackup
call from installContrailNetwork step.

PROD-22844

Change-Id: I01822714485c136f6d08dd7704f29b6571efe972
diff --git a/cloud-deploy-pipeline.groovy b/cloud-deploy-pipeline.groovy
index bf7e238..4cc597c 100644
--- a/cloud-deploy-pipeline.groovy
+++ b/cloud-deploy-pipeline.groovy
@@ -469,6 +469,7 @@
 
                     if (common.checkContains('STACK_INSTALL', 'contrail')) {
                         orchestrate.installContrailCompute(venvPepper, extra_tgt)
+                        orchestrate.installBackup(venvPepper, 'contrail', extra_tgt)
                     }
                 }