[fidl] Rename FIDL directories

These names more closely match what we publish in the SDK. Ideally, we'd
use . as the separator, but Zircon's build system cannot handle . in
directory names, so we use - instead.

Test: Builds.
Change-Id: Ia420a364d2accac39faebade8f3f8ed72088556a

[syslog] Connect to logger service.

Change-Id: If0df93f853278d62a29e06bcfd4e0e82ed35776d

[syslog] Initial implementation

This implementation supports only supports writing to file descriptors
and defaults to stdout.

Change-Id: I2aaca1cb98e0f8951e1b791c40250dc503a93b3f