buildah-bud tests: handle go pseudoversions, plus...

Handle go pseudoversions, e.g. a custom non-released buildah
used during testing of a PR. This will be something like:

   v1.20.1-0.20210402144408-36a37402d0c8

...and it makes it impossible (AFAIK) to do a shallow checkout;
we need to do a full clone of buildah, then git-checkout the
SHA (last element of the long string above).

FIXME: this is great for testing, but we almost certainly
want some way to block this PR from merging, don't we?

And, while testing this, found and fixed three bugs:

  - quote "$failhint" when echoing it on failure; otherwise
    we lose original whitespace.

  - invoke git-am with --reject! This makes it SO MUCH EASIER
    to identify the failing part of our patch!

  - sigh: generate the make-new-buildah-diffs helper *BEFORE*
    we try git-am! Otherwise, duh, if git-am fails we have no
    way to help the developer create a new diff file.

Signed-off-by: Ed Santiago <santiago@redhat.com>

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