Fix for Istruncated set to true under certain conditions.

Optimizing List Objects by using binary sort to discard entries in cases
where prefix or marker is set.

Adding test coverage to ListObjects.

Adding benchmark to ListObjects.

pkg/fs/fs-bucket_test.go

@@ -69,7 +69,7 @@ func TestGetBucketInfo(t *testing.T) {
 		{"meta-test-bucket.3", BucketInfo{Name: "meta-test-bucket.3"}, nil, true},
 	}
 	for i, testCase := range testCases {
-		//the err returned is of type *probe.Error
+		// The err returned is of type *probe.Error.
 		bucketInfo, err := filesystem.GetBucketInfo(testCase.bucketName)
 
 		if err != nil && testCase.shouldPass {