init: HACK: Try multiple times to open console

init: HACK: Try multiple times to open console

If the console is set to be a USB-to-serial adapter, there is
a bootup race for the creation of its associated device nodes
and init's one-time console detection.

If the console can't be opened, try polling up to 5 seconds. Log
an error if it ultimately fails.

A better solution would be to reimplement the console functionality
to be hot-pluggable, but this would require much more invasive changes
to make it robust.

Change-Id: I20b19095a2f22efffafe2a7ac22d2be753a62d4b
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>