vsp: Use client provided by vspd package. #2213
Merged
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The client provided by the vspd package is based on the one which this PR removes from dcrwallet, so there should be no significant difference in functionality.
Using the vspd implementation removes a lot of hard-coded duplication which is liable to fall out of sync, e.g. error codes, req/resp types, URLs.
This currently leaves no way for dcrwallet to record request/response bytes as described in the original vspd spec, however decred/vspd#364 has been opened to implement that in future.
I backported this to 1.7 and used it with autobuyer for a couple of weeks on https://testnet-vsp.jholdstock.uk - several thousand tickets processed and no issues observed.