Fix class name of GRPC::ClientInterceptor

Thong Kuahrequested to merge
fix_grpc_class_name into master

It seems that we might have called it GRPCClientInterceptor previously but as of 0.3.0, it's GRPC::ClientInterceptor.

Adds specs

Fixes gitlab-development-kit#500 (closed)

Edited by GitLab Release Tools Bot

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