Change slave label to virtual

Change-Id: I0b6ce9986aff8eac4610bb07a55bba49af942626
Related-Prod: PROD-27995 (PROD:27995)
diff --git a/packer-image-buid.groovy b/packer-image-buid.groovy
index c7bd0e5..ea02bde 100644
--- a/packer-image-buid.groovy
+++ b/packer-image-buid.groovy
@@ -65,7 +65,7 @@
 //
 defaultGitRef = job_env.get('REFSPEC', 'HEAD')
 defaultGitUrl = job_env.get('DEFAULT_GIT_URL', null)
-slaveNode = (env.SLAVE_NODE ?: 'jsl03.mcp.mirantis.net')
+slaveNode = (env.SLAVE_NODE ?: 'virtual')
 
 // Self-check
 for (String req_v : ['BUILD_OS', 'BUILD_ONLY','IMAGE_NAME'] ) {