Unable to compile s2a.proto

[pkwarren]

The newly added s2a proto files from #149 fail to compile with protoc 26.1 with the following error message:

grpc/gcp/s2a/s2a.proto:306:3: "s2a.proto.Identity" is resolved to "grpc.gcp.s2a.proto.Identity", which is not defined. The innermost scope is searched first in name resolution. Consider using a leading '.'(i.e., ".s2a.proto.Identity") to start from the outermost scope.

I believe the fix is:

--- a/grpc/gcp/s2a/s2a.proto
+++ b/grpc/gcp/s2a/s2a.proto
@@ -303,7 +303,7 @@ message SessionReq {
   // identity is not populated, S2A will try to deduce the managed identity to
   // use from the SNI extension. If that also fails, S2A uses the default
   // identity (if one exists).
-  s2a.proto.Identity local_identity = 1;
+  Identity local_identity = 1;
 
   // The authentication mechanisms that the application wishes to use to
   // authenticate to S2A, ordered by preference. S2A will always use the first

[ejona86]

@rmehta19

Looks like this wasn't noticed in the PR because the PR didn't add any Bazel targets.

[pkwarren]

Thanks for fixing - I can verify things look good now.