This puts us on a version that has grpc protocol support. Although we're
not actually using that yet, the plugin has handshake changed slightly to
allow plugins to declare whether they use the old or new protocols, and
so this upgrade allows us to support plugins that were built against
newer versions of go-plugin that include this extra field in the
handshake.
This fixes#15756.
Nomad was manually updated, so revert that to the version in master,
remove it from vendor.json and add it to the ignore list.
Update all packages that were in an unknown state to their latest master
commits.
A number of PRs have come through which modified the vendor folder
without recording the proper information. This resets everything back to
the recorded version.
James Bardin