Fixes racey tests in tsh (gravitational#7416)

Multiple routines were fighting over the global logrus `Logger`
instance, causing the race detector to trip roughly once in every 10
test runs.

This patch addresses this race condition by supplying each of the
competing processes an entirely separate logger, and ensuring that
these log instances are plumbed through to the code that would otherwise
trip the race detector.

lib/service/service.go

@@ -2512,6 +2512,7 @@ func (process *TeleportProcess) initProxyEndpoint(conn *Connector) error {
 				PollingPeriod: process.Config.PollingPeriod,
 				FIPS:          cfg.FIPS,
 				Emitter:       streamEmitter,
+				Log:           process.log,
 			})
 		if err != nil {
 			return trace.Wrap(err)

tool/tsh/tsh_test.go

@@ -807,6 +807,7 @@ func makeTestServers(t *testing.T, bootstrap ...types.Resource) (auth *service.T
 	cfg.Auth.Enabled = true
 	cfg.Auth.SSHAddr = randomLocalAddr
 	cfg.Proxy.Enabled = false
+	cfg.Log = utils.NewLoggerForTests()
 
 	auth, err = service.NewTeleport(cfg)
 	require.NoError(t, err)
@@ -844,6 +845,7 @@ func makeTestServers(t *testing.T, bootstrap ...types.Resource) (auth *service.T
 	cfg.Proxy.SSHAddr = randomLocalAddr
 	cfg.Proxy.ReverseTunnelListenAddr = randomLocalAddr
 	cfg.Proxy.DisableWebInterface = true
+	cfg.Log = utils.NewLoggerForTests()
 
 	proxy, err = service.NewTeleport(cfg)
 	require.NoError(t, err)