1. define rules in the Maven build files to compile the data protos at build time.
2. define a new vtgate service interface that uses the proto3 data structures and
defines an abstract service.
cannot have the same <package name>.<data type> as these, or we cannot
load them at the same time. So to fix this:
- renaming the conflicting ones from xxx.proto to xxxdata.proto.
- renaming vtgateservice.VTGate to vtgateservice.Vitess
Note we can still change the names I chose here, just not back to
conflicting ones. If anyone has better ideas, we can implement
in subsequent changes. This is to get the import to google3 unstuck.
Andy Diamondstein
Alain Jobart
Shengzhe Yao