Retry three time validation on changes

With more nodes and more builds it may happen
that an executor fails for disconnection with the master.

Retry up to three times the validation of change before
declaring the build as failed.

Change-Id: If040a3a8ccf969af4b9a49e87271064ec09b78b4
1 file changed
tree: b566273f4e3cd1c071a307470898b2e03d14c659
  1. jenkins/
  2. jenkins-docker/
  3. worker/
  4. .gitignore