Dumb-init

* Change to the root directory in the parent (dumb-init) process after `fork()`ing (https://github.com/Yelp/dumb-init/pull/210).

Thanks to Villemoes for the patch!

* Actually fix the bug that can cause `--help` or `--version` to crash in some scenarios (https://github.com/Yelp/dumb-init/pull/215).

Thanks to suve for the patch!

**Note on binary naming:** In 202, we switched from using Debian naming for architectures to the Linux kernel's naming for binaries. The Debian package names are unchanged. That means binaries now have these architectures in their names:

* `x86_64` (previously `amd64`)
* `aarch64` (previously `arm64`)
* `ppc64le` (previously `ppc64el`)

* Fix a bug that can cause `--help` or `--version` to crash in some scenarios (https://github.com/Yelp/dumb-init/pull/213).

Thanks to suve for the patch!

**Note on binary naming:** In 202, we switched from using Debian naming for architectures to the Linux kernel's naming for binaries. The Debian package names are unchanged. That means binaries now have these architectures in their names:

* `x86_64` (previously `amd64`)
* `aarch64` (previously `arm64`)
* `ppc64le` (previously `ppc64el`)

* Fix a race condition which can cause the child to receive SIGHUP and SIGCONT very shortly after start (174).

In general this was very rare, but some environments (especially some container and virtualization environments) appear to encounter it at a much higher rate, possibly due to scheduler quirks.

**Note on binary naming:** In 202, we switched from using Debian naming for architectures to the Linux kernel's naming for binaries. For compatibility, we've kept the old names around in this release. This means that these files are identical:

* `dumb-init_1.2.2_x86_64` (old name `dumb-init_1.2.2_amd64`)
* `dumb-init_1.2.2_aarch64` (old name `dumb-init_1.2.2_arm64`)
* `dumb-init_1.2.2_ppc64le` (old name `dumb-init_1.2.2_ppc64el`)

In the next release, only the binaries with the updated architecture naming will be uploaded. The Debian packages will continue to be named as-is.

* Fix verbose debug logging for ignored signals.

Before this patch, they were reported in the verbose log as "forwarded
signal 0 to children" instead of "not forwarding signal to children".

Since signal 0 is a noop, there is no actual behavior change here.

Thanks kpengboy for the patch!

* Fix Python package installation on platforms without `-static` support (e.g. Mac OS X)

Thanks NicolasLM for the issue and asottile for the patch!

- Hand the controlling TTY to the child process, if we have one (122).

This fixes warnings that are printed when running a typical command like:
docker run -ti <image> dumb-init bash
...as well as allowing you to use job control.

Thanks to ehlers for the patch, and alhafoudh (and several others) for
reporting the issue and providing details!