Basic PoC for DLog stdout redirector

Basic PoC for DLog stdout redirector

Set Standard{Output,Error}=dlog in a service file,
or DefaultStandard{Output,Error}=dlog for global.

Note that setting the global default should only
really be done if DLog is working under the Android
Logger backend, since the Pipe backend daemon is
not really available early on which can make early
daemons fail.

Change-Id: Icf7224d1fabd4cdb45971ac9314ed4d19d220bbb