bump executor
bump executor

Submodule src/github.com/cloudfoundry-incubator/executor e26be6a..ad266c2:
  > Merge pull request #12 from cloudfoundry-incubator/fix-metrics-tests

Signed-off-by: Jen Spinney <475b118f8db4f150e7ed3b69b35fd7c857f9c9f8@hp.com>

cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release,cloudfoundry-incubator/diego-release