This tells the plugin both the `lightning-dir` as well as the
`rpc-filename` to use to talk to `lightningd`. Prior to this they'd
had to guess.
Signed-off-by: Christian Decker <decker.christian@gmail.com>
Both of these plugins will fail in interesting ways, and we should
still handle them correctly.
Signed-off-by: Christian Decker <decker.christian@gmail.com>