bump grootfs
bump grootfs

Submodule src/code.cloudfoundry.org/grootfs 8efc8b7..fa1c24c:
  > Close container image source after create
  > Inject the base image URL into the fetcher

Signed-off-by: Danail Branekov <43f82d874965b9fe2876a1a864fffde1e64d6143@gmail.com>
Signed-off-by: Julia Nedialkova <7434cf6db6c17ad5b6ef614abe065a9cda1d30c1@hotmail.com>

cloudfoundry-incubator/guardian-release,cloudfoundry-incubator/guardian-release,cloudfoundry-incubator/guardian-release