XigmaNAS/svn 6661branches/11.2.0.4/etc rc.firmware, branches/11.2.0.4/etc/install zfsinstall.sh

code changes provided by JoseMR: zfs installer updates and enhancements
DeltaFile
+218-39branches/11.2.0.4/etc/install/zfsinstall.sh
+142-9branches/11.2.0.4/etc/rc.firmware
+360-482 files

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