2352aa9 test: Ensure that recursive -includeconf produces appropriate warnings (Karl-Johan Alm)
c5bcc7d util: warn about recursive -includeconf arguments in configuration files (Karl-Johan Alm)
Pull request description:
This is a follow-up PR to #10267, and addresses https://github.com/bitcoin/bitcoin/pull/10267#issuecomment-387546144. ~~I am adding extra work for @jnewbery in #12755 here -- maybe I should just rebase on top of that, but not sure what the appropriate approach is here.~~
Tree-SHA512: 87f0c32436b70424e33616ffb88d7cb699f90d6a583a10237e224b28fc936d6a9df95536c8c52ee8546b3942da92b2a357e61bf87e00d1462bc10d46d3bee352
Backport of Core PR13197
https://github.com/bitcoin/bitcoin/pull/13197/