bump ltc
bump ltc

[finishes #106157688]

Submodule src/github.com/cloudfoundry-incubator/ltc 78cf39f..7470eb9:
  > ltc sync uses new target instead of previous target

Signed-off-by: Damon Anderson <93b19e97294520db5d300a69ac27bdbeaec3051d@pivotal.io>

cloudfoundry-incubator/lattice-release,cloudfoundry-incubator/lattice-release,cloudfoundry-incubator/lattice-release,cloudfoundry-incubator/lattice-release,cloudfoundry-incubator/lattice,cloudfoundry-incubator/lattice,cloudfoundry-incubator/lattice,cloudfoundry-incubator/lattice