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f08154cc7b
When we use /dev/loopX device - shift first PV1 sector by 1M so /dev/loop0 and dm device do not appear as same device. Also notify lvmetad once 'devs' are created - so in case this command is called in the middle of test - lvmetad properly drops its metadata for these devices. Drop used test.img file between reuse so the 'prepare_vg' always starts with zeroed disks. When LVM_TEST_AUX_TRACE is set, allow shell tracing of aux commands.