Add support for xz compressed initrds.
Default options for xz compression taken from dracut.
This change also removes various /bin/ path prefixes as there was
previously a mix. xz* tools are technically in /usr so thus support
may not be 100% complete until we have finished the /usr merge in
mga3 and as such gzip compressed initrds should likely remain the default
for mga2.
No support for xz compressed initrds has yet been added to the remove-boot-splash
script which is inexplicably implemented in perl rather than in bash
like the rest of the scripts.
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