If we find old noderefs (e.g. us1.testnet.chainweb.com), we remove them
and put the correct uri (api.testnet.chainweb.com)

just replace the entries for the network names "Testnet" and "Mainnet"

also fixed upgrade procedure

these new test cases will investigate how chainweaver
recovers from a migration that fails at some point before
completion.

In essence, we don't care what networks the user has either created,
modified or left alone, we filter out undesired noderefs in that network name.

It is equivalent to "These" except that we take out the
"This" constructor. With it gone, we still get the same applicative
operations from "These" (sans "This") but we don't have to account for
the "This" constructor in situations where we know it is impossible to
produce it.

The datatype we really want is something equivalent to Either () a but
with a different Applicative instance.

make "Deez" a newtype