Fix for fabric.p4 job

- set the basedir of the scm to empty
- fix the branch regex (onos-2.*)

Change-Id: I3fa907bd1cff80b704443f08119a3c6ef7011d54
diff --git a/jjb/templates/fabric-p4-verify.yaml b/jjb/templates/fabric-p4-verify.yaml
index 31c920c..3fd2e00 100644
--- a/jjb/templates/fabric-p4-verify.yaml
+++ b/jjb/templates/fabric-p4-verify.yaml
@@ -57,7 +57,7 @@
           submodule-recursive: '{submodule-recursive}'
           choosing-strategy: gerrit
           jenkins-ssh-credential: '{jenkins-ssh-credential}'
-          basedir: '{project}'
+          basedir: ''
 
     triggers:
       - gerrit: