ONL installer gets unknown onie_platform in latest ONIE about opennetworklinux HOT 4 CLOSED

I did a test on AS7712_32X having a revised ONIE keeping machine.conf in the initrd image which can install latest ONL normally.

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@david56
The existing design was a convenience since the installer itself runs as part of the Loader initrd in multiple envirnonments. But it isn't necessary (especially if it no longer works).

@carlroth Lets modify the platform detection logic to remove the chroot into ONIE.
This means the platform id must be passed as a configuration parameter to the installer prior to entering the Loader initrd instead of the installer detecting it itself.

Environment override

1. if $ONL_INSTALL_PLATFORM then echo "platform=$ONL_INSTALL_PLATFORM" >> installer.conf

Installing from ONIE
2. If ONIE: echo "platform=onie-sysinfo -p >> installer.conf

Installing form ONL
3. If ONL : echo "platform=$(cat /etc/onl/platform)" >> installer.conf
etc.

What do you think?

cc @cbrune

from opennetworklinux.

see #287

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The latest ONL can be installed via latest ONIE normally now. Thank you.

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