use --cluster-id flag to accommodate 'kafka-storage random-uuid' output that's dash-prefixed

[laser]

Problem

Occasionally, the kafka-storage random-uuid command outputs a - prefixed string, which causes the kafka-storage format command to fail. An example of this (which we recently saw in CI) was the string -f_5rGTAQYmTztSSUAVNuQ.

Solution

The --cluster-id flag doesn't have the same limitations w/respect to dash-prefixed cluster ids as -t does, so use that.