This commit adds the utility testing function TempDir, which provides a
tester with a temporary directory as well as a means of cleaning up that
directory. The new function is implemented everywhere that makes sense
throughout the code base.
This also cleans up the directories left behind by go-git's testing
fixtures.
Some light refactoring was also performed in this change.
Change-Id: I754484934660487140f57671bacb5463cf669e3e
This commit adds the `tidy` target. This target will fail if the go.mod
or go.sum files are not up to date with the code. It will also be a
prerequisite to the `lint` command, implying that it will also be caught
by the Zuul gates.
Change-Id: Ie33de2d793beca100435670346eb0e2ea7b3b0dd
