This is a first step toward that goal, using the ProposedAccepted type
in RemoteConfig lets initremote/enableremote reject bad parameters that
were passed in a remote's configuration, while avoiding enableremote
rejecting bad parameters that have already been stored in remote.log
This does not eliminate every place where a remote config is parsed and a
default value is used if the parse false. But, I did fix several
things that expected foo=yes/no and so confusingly accepted foo=true but
treated it like foo=no. There are still some fields that are parsed with
yesNo but not not checked when initializing a remote, and there are other
fields that are parsed in other ways and not checked when initializing a
remote.
This also lays groundwork for rejecting unknown/typoed config keys.
All that needs to be retained in remote.log is the sameas-uuid.
The rest of the config is eliminated. This doesn't save enough space to
bother with, but it prevents anything sensitive in the config of the
dead sameas remote from lingering around.
Note that minimizesameasdead does not update the VectorClock when
changing the log line. That's normally a no-no, but in this case,
it makes each DropDead result in the exact same file contents,
and vector clocks are not needed because the transition breaks
the history chain.
