Default parameter for branch to 2.7 for verification

Change-Id: I34775b1c9aafad2d4e12d0a7fa10ccd754a81227
diff --git a/jjb/defaults.yaml b/jjb/defaults.yaml
index a4cc292..8d297f0 100644
--- a/jjb/defaults.yaml
+++ b/jjb/defaults.yaml
@@ -84,7 +84,7 @@
     modern-branches-regexp: '^(master|cord-7.0|cord-6.1|cord-6.0|seba-1.0|voltha-2.3|voltha-2.4)$'
     platform-branches-regexp: '^(master|cord-7.0|cord-6.1)$'
     seba-branches-regexp: '^(master|cord-7.0|seba-1.0)$'
-    kind-voltha-regexp: '^(voltha-2.6)$'
+    kind-voltha-regexp: '^(voltha-2.7)$'
 
     # matchs all project repos
     all-projects-regexp: '.*'