bazel: Allow to distdir all dependencies
bazel: Allow to distdir all dependencies

To use --distdir option of Bazel (which allows to use previously
fetched tarballs instead of downloading dependencies during
build), all dependencies should use http instead of git and need
to have sha256 sums specified.

Signed-off-by: Michal Rostecki <82ebf970c69340aebb770c3853be5fd96a3eb584@suse.de>

grpc-ecosystem/grpc-httpjson-transcoding,grpc-ecosystem/grpc-httpjson-transcoding