This renames the mempool.Config.RelayNonStd option to AcceptNonStd which
more accurately describes its behavior since the mempool was refactored
into a separate package.
The reasoning for this change is that the mempool is not responsible for
relaying transactions (nor should it be). Its job is to maintain a pool
of unmined transactions that are validated according to consensus and
policy configuration options which are then used to provide a source of
transactions that need to be mined.
Instead, it is the server that is responsible for relaying transactions.
While it is true that the current server code currently only relays txns
that were accepted to the mempool, this does not necessarily have to
be the case. It would be entirely possible (and perhaps even a good
idea as something do in the future), to separate the relay policy from
the mempool acceptance policy (and thus indirectly the mining policy).
This updates the minimum relay fee in the sample config file to match
the actual default. Note that it's commented anyways, so this does not
result in any logical change. However, the file aims to have the
defaults commented out by default, so it makes sense to update the
value accordingly.
This adds a readme and doc.go for the sampleconfig package so it is
consistent with all of the other packages.
While here, it also changes the exported value to a constant and removes
the unused sampleConfigFilename constant.
