WL#2777: SHOW SLAVE STATUS: Add LIKE support

Affects: Server-7.1   —   Status: Un-Assigned   —   Priority: Medium

Idea from Sasha after reviewing some of the replication test case failures.
Implementing SHOW SLAVE STATUS LIKE so that we can see only the columns that we
are interested in could be used in test cases to make tests more deterministic
without always having to do --replace_column.