Backport PR9906 https://github.com/bitcoin/bitcoin/pull/9906/files
188f89c Disallow copy of CReserveKeys (Gregory Sanders)
Tree-SHA512: e55ce10bf7f2dc91de9797e60ab7767fb51f25255995d62ddf358c52b7aaa23c26fbfb522e1610ff950b86804ddbc38dc0d7708bfab2c4d33ad99a275d8c77db