configure a tracking branch for all submodules
configure a tracking branch for all submodules

Signed-off-by: Sheel Choksi <ae3f9674456405c06387031a36653604e96a41b0@pivotallabs.com>

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