Adds support for ipc socket permissions

[seunlanlege]

Adds support for setting file permissions using chmod on IPC sockets through CLI or config files.

closes #9703

[dvdplm]

Looking good, but I have questions!

[dvdplm]

@seunlanlege once this lands, make sure you edit the wiki to document the new option.

[seunlanlege]

Putting this on ice because parity-tokio-ipc doesn't support android builds, yet

[dvdplm]

Putting this on ice because parity-tokio-ipc doesn't support android builds, yet

error[E0308]: mismatched types
  --> /ci-cache/parity-ethereum/cargo/build-android/registry/src/github.com-1ecc6299db9ec823/parity-tokio-ipc-0.3.0/src/unix_permissions.rs:50:37
   |
50 |             if chmod(path.as_ptr(), mode) == -1 {
   |                                     ^^^^ expected u16, found u32
help: you can convert an `u32` to `u16` and panic if the converted value wouldn't fit
   |
50 |             if chmod(path.as_ptr(), mode.try_into().unwrap()) == -1 {
   |                                     ^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.
error: could not compile `parity-tokio-ipc`.

Is that what you mean? Seems more like a legit error than some incompatibility to me.

[niklasad1]

@dvdplm it is fixed in paritytech/parity-tokio-ipc#18

I think we can change label to in progress

[niklasad1]

LGTM

[niklasad1]

@seunlanlege please commit the updated Cargo.lock in order to fix the CI errors.

[dvdplm]

lgtm modulo CI