MB-30020 Test command specific error context
MB-30020 Test command specific error context

Test that the command specific checks performed by the MCBP validators
set the request cookie's error context upon validation failure.

Change-Id: Iccb8aa1efdee69557245d1540d2312b20ce74754
Reviewed-on: http://review.couchbase.org/98881
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine