[bitcoin/bitcoin] Add createwallet “disableprivatekeys” option: a sane mode for watchonly-wallets (#9662)

Overhauled this PR.
* Removed the global `-disableprivatkeys` argument.
* Added an `options` object to `createwallet` with currently a single boolean `disableprivatekeys`.

This post was last modified on June 13, 2018, 10:51 pm