execute module replacement in a single command

[WeidiDeng]

When testing http3 graceful shutdown, I found out I can't build caddy with local plugin by xcaddy build http3-graceful --with github.com/quic-go/quic-go=github.com/WeidiDeng/quic-go@graceful-close --with plugin=path, I have to manually switch with positions.

Turns out the multiple replaces can be executed at once, so the order no longer matters.

[francislavoie]

Seems sensible. This only affects --with options that have an =, right?

[WeidiDeng]

Didn't test. But isn't the whole point of with to specify a particular module version that's different from caddy default? That's why it's called replace.

I guess with with or without = will be affected, but the build process can go smooth in more cases.

[mohammed90]

Thanks for the fix!