A set of followup PRs:
- tests/lib: generalize RPM build support : https://github.com/snapcore/snapd/pull/3449
- packaging/{opensuse,fedora}: allow package build with testkeys included: https://github.com/snapcore/snapd/pull/3450
- tests/main: use dir abstraction in a few more test cases: https://github.com/snapcore/snapd/pull/3451
- tests/main: check for confinement in a few more interface tests: https://github.com/snapcore/snapd/pull/3452
- tests/main/manpages: install missing man package: https://github.com/snapcore/snapd/pull/3453
- spread: add fedora snap bin dir to global PATH: https://github.com/snapcore/snapd/pull/3454
- tests/main: use pkgdb function in more test cases: https://github.com/snapcore/snapd/pull/3455