on Keyring - new vault creation should wipe the entire state before doing it

[brunobar79]

Because all the data in state is not relevant anymore

[Gudahtt]

Related: MetaMask/metamask-extension#2989

[desi]

We believe this has been handled by work completed on the keyring controller since this was originally created. Clearing other wallet state would be out of scope for this repo. Closing as addressed.