WL#3733: NdbRecord optimisation for mysqld

Affects: Server-6.0   —   Status: Complete   —   Priority: Low

Use the new NdbRecord (WL#2223) interface in mysqld instead of the old
NdbRecAttr interface, to speed up the mysqld cluster engine.

May need to tweak the NdbRecord interface slightly to make it work better with
the mysqld code, to be determined as part of the implementation (NdbRecord was
from the start designed to be a good fit with mysqld).
See WL#2223.
See WL#2223.