Ensure that grpc server log messages are sent to logrus
GRPC log messages are not using logrus.
For example
INFO[0000] Starting Gitaly version=
DEBU[0000] Using sentry logging
INFO[0000] listening at tcp address address=":9999"
INFO[0000] Starting prometheus listener address=":9236"
2017/06/02 09:24:40 transport: http2Server.HandleStreams received bogus greeting from client: "GET / HTTP/1.1\r\nHost: lo"
2017/06/02 09:25:42 transport: http2Server.HandleStreams failed to receive the preface from client: read tcp 192.168.0.2:9999->192.168.0.12:58798: read: connection reset by peer
With this change:
INFO[0000] Starting Gitaly version=
INFO[0000] listening at tcp address address=":9999"
INFO[0000] Starting prometheus listener address=":9236"
INFO[0002] transport: http2Server.HandleStreams received bogus greeting from client: "GET / HTTP/1.1\r\nHost: lo"