6665977 remove 'label' filter for rpc command help (Gregory Sanders)
Tree-SHA512: 0676c55b2893a469cd6785963affbb04126b9a32c130f1bb22dfd233ede6998f695187264e897ced4e0dac48451d9ae0311ebb4f7442096cad632fd22f75080e
Backport of Core PR9894
https://github.com/bitcoin/bitcoin/pull/9894/files