lokinet-vpn does not work with ipc sockets + ipc by default

[majestrate]

when lokinet uses an ipc socket and we have the ability to access it just fine

/usr/bin/lokinet-vpn --rpc ipc:///var/lib/lokinet/rpc.sock --down

prints std::bad_cast and exits with status 2, instead of calling the rpc endpoint it needed to.

[jagerman]

Additionally, we should make lokinet listen on the rpc.sock IPC socket by default.

[dr7ana]

I believe @majestrate original bug is fixed by the CLI refactor and subsequent logic fixes as documented below (pending reproduction by others). Assuming that's confirmed, can get started on @jagerman default IPC socket listening enhancement (Note: #2110 tracks this specific enhancement)

Reproduced Error

oxen/lokinet dev branch commit bf0dc52df7c05d4a14b5d5140615c1d547430055

Lokinet:

lokinet --config /home/dan/tmp/rpc.sock

Lokinet-vpn

Working Functionality

drouhana/lokinet cli-refactor branch commit 26beebca97d66a87d4cb8f5b67d44b242c0e7797

Note: oxen/lokinet dev branch latest commit includes the CLI refactor code in the above commit

Lokinet

(identical command as above)

Lokinet-vpn