[#583] Fix list-buckets vhs routing

The problem is that with VHS requests,
the list-buckets operation does not work
because the request is filtered on
list-objects-v1. Since list-buckets can
also have query parameters, in the end it
is necessary to distinguish list-buckets
from list-objects-v1 only by the presence
of the bucket name in the URL (provided
that the request is in VHS style).

Signed-off-by: Roman Loginov <r.loginov@yadro.com>

api/middleware/policy.go

@@ -24,13 +24,16 @@ import (
 )
 
 const (
-	QueryVersionID    = "versionId"
-	QueryPrefix       = "prefix"
-	QueryDelimiter    = "delimiter"
-	QueryMaxKeys      = "max-keys"
-	QueryMarker       = "marker"
-	QueryEncodingType = "encoding-type"
-	amzTagging        = "x-amz-tagging"
+	QueryVersionID         = "versionId"
+	QueryPrefix            = "prefix"
+	QueryDelimiter         = "delimiter"
+	QueryMaxKeys           = "max-keys"
+	QueryMarker            = "marker"
+	QueryEncodingType      = "encoding-type"
+	QueryMaxBuckets        = "max-buckets"
+	QueryContinuationToken = "continuation-token"
+	QueryBucketRegion      = "bucket-region"
+	amzTagging             = "x-amz-tagging"
 
 	unmatchedBucketOperation = "UnmatchedBucketOperation"
 )