Automatic merge from submit-queue
Additional go vet fixes
Mostly:
- pass lock by value
- bad syntax for struct tag value
- example functions not formatted properly
In order to allow a Go type to have a different internal representation,
provide the comment `// +protobuf.as=MESSAGENAME` which substitutes the
current message's members with the named message's members. Used by the
unversioned.Time type to have the same fields as unversioned.Timestamp
and to have an alternate serialization.
The protobuf tags contain the assigned tag id, which then ensures
subsequent generation is consistently tagging (tags don't change across
generations unless someone deletes the protobuf tag).
In addition, generate final proto IDL that is free of gogoproto
extensions for ease of generation into other languages.
Add a flag --keep-gogoproto which preserves the gogoproto extensions in
the final IDL.
