libstorage: Two fixes

This update fixes the following issues with libstorage:
- bnc#825503: adapt to changed functionality of losetup
- bnc#810305: fix wrong size calculation when deleting thin LVs

Fixed bugs
bnc#810305
yast partitioner suggests creation of too large logical volume
bnc#825503
libstorage doesn't handle /dev/loop* absence properly
Selected Binaries
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