Backports #15754 to the 0.18 branch
#15754 added the help message for getrpcinfo
Github-Pull: #15754
Rebased-From: f4b7a2f2055fa52d5e02c37bed7b46599b960e2e
Restarted appveyor.
utACK 60d4621.
utACK 60d4621
utACK 60d46219754692355aef719681a7d80ec38035bc FWIW: it's not necessary to open individual backport PRs for PRs that trivially backport to the branch But as it has the required backport meta-data I'm just going to merge
Milestone
0.18.0