build: image: posix compatibility cut v head
Replace 2 instances of non posix use of 'head' with posix compliant 'cut'. 'head -c n' cuts 'n' bytes from the passed string and happens to work on Linux & Mac OS X even though '-c' is not posix. 'head --bytes n' does the same thing and happens to work on linux but not on Mac OS X and is also not posix. 'cut -b1-8' cuts the first 8 bytes from the passed string and is posix compliant, hence works on Linux & Mac OS X. Our usage of 'head --bytes' was particularly unfortunate since it was used to calculated the RootFS UUID passed to grub - the net result being a non-functioning system waiting for the root file system to appear. Thanks to karlp, ynezz & others for pointers on solving this. Signed-off-by: Kevin Darbyshire-Bryant <ldir@darbyshire-bryant.me.uk>master
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