[openSUSE] improve JeOS compatibility re ROOT label. Fixes #2062 #2063
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To enable the use of btrfs based openSUSE JeOS images we required a change from our default root pool label expectation (enforced default where non found) to be in line with the default found, and depended upon (fstab mount by label) in these JeOS images.
Summary of changes:
Fixes #2062
Testing.
An existing openSUSE (Tumbleweed) source based install was recompiled in place and found to successfully self migrate from a 'system' root pool label to the new default of 'ROOT'. Note that source based installs are expected to be recompiled and there are, as yet, no rockstor rpms distributed for openSUSE.