Added lint to the targets for voltha-docker-tools.

Change-Id: I95635cef839bff20be684b75334167c1966aee46
diff --git a/jjb/verify/voltha-docker-tools.yaml b/jjb/verify/voltha-docker-tools.yaml
index 9101c92..5a5686e 100644
--- a/jjb/verify/voltha-docker-tools.yaml
+++ b/jjb/verify/voltha-docker-tools.yaml
@@ -18,7 +18,7 @@
           dependency-jobs: 'verify_voltha-docker-tools_licensed'
       - 'make-unit-test':
           build-timeout: 30
-          unit-test-targets: 'docker-build'
+          unit-test-targets: 'docker-build lint'
           junit-allow-empty-results: true
 
 - job-group: