Deflake libdm#CreateEmptyDevice test
Judging from local experiments, it looks like device-mapper doesn't always generate a uevent after DM_DEV_CREATE ioctl. Test: presubmit Bug: 193462349 Change-Id: I8a74375631b20c14a32a41dbaf38380ebc0078e6 Merged-In: I8a74375631b20c14a32a41dbaf38380ebc0078e6
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