Update git submodules
* Update oslo.policy from branch 'master' to 4b7a6f7753e282a5059bdbbf10258de8016fbffb - Merge "Use consistent commands for coverage" - Use consistent commands for coverage This updates the command executed in the cover target to make these more consistent with the other repos. The main change is now we ensure old data is erased before executing the steps. Change-Id: I2c2b8a60ddfda9b8184e61113d11a7bdafe113c7
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