Fixed test failing due to namespace overlap

Signed-off-by: Zach Speaks <zspeaks@amazon.com>

Author: zspeaks

pkg/api/api_test.go

@@ -84,7 +84,7 @@ func TestNewApiWithoutHeaderLogging(t *testing.T) {
 	}
 	serverCfg := server.Config{
 		HTTPListenNetwork: server.DefaultNetwork,
-		MetricsNamespace:  "with_header_logging",
+		MetricsNamespace:  "without_header_logging",
 	}
 	server, err := server.New(serverCfg)
 	require.NoError(t, err)

pkg/api/middlewares.go

@@ -4,12 +4,12 @@ import (
 	"context"
 	"net/http"
 
-	util_log "github.com/cortexproject/cortex/pkg/util/log"
 	"github.com/weaveworks/common/middleware"
 
 	"github.com/cortexproject/cortex/pkg/chunk/purger"
 	"github.com/cortexproject/cortex/pkg/querier/queryrange"
 	"github.com/cortexproject/cortex/pkg/tenant"
+	util_log "github.com/cortexproject/cortex/pkg/util/log"
 )
 
 // middleware for setting cache gen header to let consumer of response know all previous responses could be invalid due to delete operation