feat(disk_util): Add support for extracting partitions.
feat(disk_util): Add support for extracting partitions.

This will simplify the process of generating update payloads.

endocode/scripts,nicescale/scripts,andrejro/coreos--scripts,coreos/scripts,vmware/coreos-scripts,andrejro/coreos--scripts,smilart/scripts,sigma/coreos-scripts,fivethreeo/scripts,glevand/coreos--scripts,andrejro/coreos--scripts,smilart/scripts,fivethreeo/scripts,mischief/scripts,marineam/coreos-scripts,mjg59/scripts,coreos/scripts,endocode/scripts,BugRoger/scripts,zhang0137/scripts,nicescale/scripts,gtank/scripts,BugRoger/scripts,nicescale/scripts,trnubo/scripts,vmware/coreos-scripts,mischief/scripts,glevand/coreos--scripts,sigma/coreos-scripts,marineam/coreos-scripts,endocode/scripts,BugRoger/scripts,vmware/coreos-scripts,marineam/coreos-scripts,zhang0137/scripts,mjg59/scripts,mischief/scripts,zhang0137/scripts,trnubo/scripts,fivethreeo/scripts,mjg59/scripts,gtank/scripts,sigma/coreos-scripts,trnubo/scripts,smilart/scripts,gtank/scripts