[SPARK-18464][SQL][FOLLOWUP] support old table which doesn't store schema in table properties

## What changes were proposed in this pull request?

This is a follow-up of https://github.com/apache/spark/pull/15900 , to fix one more bug:
When table schema is empty and need to be inferred at runtime, we should not resolve parent plans before the schema has been inferred, or the parent plans will be resolved against an empty schema and may get wrong result for something like `select *`

The fix logic is: introduce `UnresolvedCatalogRelation` as a placeholder. Then we replace it with `LogicalRelation` or `HiveTableRelation` during analysis, so that it's guaranteed that we won't resolve parent plans until the schema has been inferred.

## How was this patch tested?

regression test

Author: Wenchen Fan <wenchen@databricks.com>

Closes #18907 from cloud-fan/bug.