Fixes for less used options of clone

This version of mepo has bug fixes for lesser-used options of mepo clone, allrepos and registry

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From CHANGELOG.md

Fixed

• Fixed bugs in the lesser used options of mepo clone, allrepos and registry

Added

• Added tests for mepo clone --allrepos and mepo clone --registry

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What's Changed

• Fixes for less used options of "mepo clone" by @pchakraborty in #335

Full Changelog: v2.2.0...v2.2.1