Update Vault to 0.5.3 (#142)
Update Vault to 0.5.3 (#142)

This updates vault to 0.5.3, and includes some optimizations:

- GO15VENDOREXPERIMENT is no longer needed, as
  the Dockerfile uses Go 1.6+
- Added XC_OSARCH to prevent building all possible
  OS/Arch combinations during build

Signed-off-by: Sebastiaan van Stijn <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@gone.nl>
rothgar/dockerfiles,alanbrent/dockerfiles,ricardorsierra/dockerfiles,michael-k/dockerfiles-jfrazelle,jfrazelle/dockerfiles,koep/dockerfiles,ricardorsierra/dockerfiles,johnsandiford/dockerfiles,jessfraz/dockerfiles,ricardorsierra/dockerfiles,michael-k/dockerfiles-jfrazelle,konstruktoid/dockerfiles,michael-k/dockerfiles-jfrazelle,saneax/dockerfiles,johnsandiford/dockerfiles,konstruktoid/dockerfiles,michael-k/dockerfiles-jfrazelle,jessfraz/dockerfiles,alanbrent/dockerfiles,koep/dockerfiles,rothgar/dockerfiles,johnsandiford/dockerfiles,jessfraz/dockerfiles,johnsandiford/dockerfiles,koep/dockerfiles,koep/dockerfiles,ricardorsierra/dockerfiles,saneax/dockerfiles,johnsandiford/dockerfiles,michael-k/dockerfiles-jfrazelle,rothgar/dockerfiles,ricardorsierra/dockerfiles,koep/dockerfiles,jessfraz/dockerfiles,konstruktoid/dockerfiles,konstruktoid/dockerfiles,jfrazelle/dockerfiles,alanbrent/dockerfiles,jessfraz/dockerfiles