Updated master name

Author: brndoko

samples/features/sql-big-data-cluster/app-deploy/SSIS/spec.yaml

@@ -2,5 +2,5 @@ name: back-up-db
 version: v1
 runtime: SSIS
 entrypoint: ./back-up-db.dtsx
-options: /REP V /CONN "MasterSQL"\;"\"Data Source=service-master-pool;User ID=sa;Initial Catalog=master;Password=[SA_PASSWORD]\""
-schedule: "*/1 * * * *"
+options: /REP V /CONN "MasterSQL"\;"\"Data Source=master-0;User ID=sa;Initial Catalog=master;Password=[SA_PASSWORD]\""
+schedule: "*/1 * * * *"