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This PS mounts extra 80Gb volume if available and mounts it to /opt/ext_vol. It also alters docker and containerd configs to move their root folder to that extra volume. This helps zuul gates to succeed when a node with 40Gb volume is assigned to a zuul gate. Change-Id: I1c91b13c233bac5ebfe6e3cb16d4288df2c2fe80