live-initramfs code review

[jordipujolp at gmail.com (Jordi Pujol)]

specifying the values for 
root_persistence="$(get_param_value 'rootpersistence=')"
root_persistence, homepersistence, rootsnapshotlabel and homesnapshotlabel 
give a lot of possibilities for configuring multiple Operating Systems and 
partitions in only one disk unit.
and allowing this values to be blank will speed up a lot the startup process
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