Integrate meta-seconorth-distro/move-sharedconf

Commit: seco-ne/yocto/layers/meta-seconorth-distro@0b17c49b

sharedconf: Move recipe to machine layer.

Also remove image deps to it, as it should be integrated as machine dep. Rename to seco-sharedconf

BCS 746-001463

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Commit: seco-ne/yocto/layers/meta-seconorth-distro@001a8788

sharedconf: Change to use code from external repo

Delete local copy of the source code, adapt recipe to fetch it from remote.