[mq]: inslist-race
Fix compiler warning:

../../../../ext/test/memrata/memrata.c:2612: error: unused variable ‘kvs_options’
../../../../ext/test/memrata/memrata.c:2612: error: unused variable ‘p’
Fix logic in WT_CURSOR_NEEDVALUE: only copy values if they are not already in the WT_ITEM's memory.

Found by valgrind reporting "Source and destination overlap in memcpy".
lint
Avoid a race installing an insert list.
whitespace