Follow-up patch:
Remame select_result and decendants to Query_result

Note: This is a re-push of a patch reverted by mistake.
The original patch went into 5.7. This patch is now 5.8 only.

(cherry picked from commit 6a1752c32919ba1e1779ace1e7561c5558d883f0)

Conflicts:
	sql/sql_derived.cc