MB-40081: Revert "MB-37159: Enable DelVBucketConcurrentOperationsTest test"
MB-40081: Revert "MB-37159: Enable DelVBucketConcurrentOperationsTest test"

This reverts commit 78bdb85fdd1b1a45eb1975c0f2734fb7ad68915c.

The DelVBucketConcurrentOperationsTest test intermittently fails in
KV-Engine CV. This revert disables the test under magma only.

Change-Id: I3bc01477f15bb9526fd614127e53bae2f4902871
Reviewed-on: http://review.couchbase.org/c/kv_engine/+/131170
Tested-by: James Harrison <5c25a7b3db09830813688775bfc8e6de736a230c@couchbase.com>
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@couchbase.com>

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