Setting a label also sets the account, but the LBRY app
only looks at the default "" account. Marking the imported
keys would have been nice, but it doesn't work.
* script to migrate private keys to lbrycrd
* handle compressed keys too
* validate private key actually gets added
* add lbrycrdd and lbrycrd-cli checks
* exit if no wallet path
* move each imported address into the default account
