Use fdio_ns_connect to connect to services in a namespace. For pure
persistant fidl services the old path of creating a file descriptor and
then opening a channel to that file descriptor doesn't work.
We should provide a way to directly connect to a service without first
treating it as a file.
Test:
* workstation.frank, reboot button on main menu works.
* astro, device_settings "erase user data" reboot works.
Change-Id: I725ba9350547309bebb5530aa44236f841d88f99
This rolls to CIPD package versions:
macOS SDK: pWygawI3vBzP9dYloEvKka8r1p0NpLLZzZQ-yMYI1UIC
Linux SDK: L_ORUWXyDEC29pSiSyKIwGqcFMQFsV91E3h_wPbUIUkC
Applies two breaking changes from the SDK:
* `zx_clock_get_new()` has been eliminated and replaced with
`zx_clock_get()`. See:
https://fuchsia-review.googlesource.com/c/fuchsia/+/293688
* Scenic `Metrics` no longer supports operator==; instead we use
`fidl::Equals()`.