Rename --local to --offline

[Stebalien]

Related to: ipfs/kubo#4182
Go-ipfs proposal: ipfs/kubo#5825 (comment)

The local flag was supposed to mean "do this on the client, not the daemon" (I think?). However, that hasn't been true for a while. Now it just means "don't use the network for this operation".

Proposal:

1. Rename --local to --offline (replacing the daemon --offline flag with the global --offline flag (chore: rename local option to offline #1850).
2. Make it apply everywhere.

[alanshaw]

I'm fine with this. I think there's only a few places in the code where the local flag is observed - it needs to be reviewed and a rename is a good chance to do that.

Just one weird question, can it be used with the HTTP API? In this context "offline" and "don't go to the network" doesn't fit right as we're clearly already talking over the network!...and "local" makes more sense...

cc @magik6k

[magik6k]

We have to expose API somehow, and it just happens to be over the network too. This option only affects the 'libp2p network' part of ipfs, so yeah, it can be used with HTTP API.