Modify flags when needed to accommodate pflag #1534
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pflag, while mostly great for our usecase in the tuf package, expects getopt-style flags, which means it doesn't support the Golang standard of using single and double dashes interchangeably for flags. (e.g., pflag cannot parse
-config, but Golang treats-configthe same as--config.)This PR transforms all single-dash args to double-dashes so that pflag can parse them as expected.