Update the osbuild/images to the version which introduces "dot notation"
for distro release versions.
- Replace all uses of distroregistry by distrofactory.
- Delete local version of reporegistry and use the one from the
osbuild/images.
- Weldr: unify `createWeldrAPI()` and `createWeldrAPI2()` into a single
`createTestWeldrAPI()` function`.
- store/fixture: rework fixtures to allow overriding the host distro
name and host architecture name. A cleanup function to restore the
host distro and arch names is always part of the fixture struct.
- Delete `distro_mock` package, since it is no longer used.
- Bump the required version of osbuild to 98, because the OSCAP
customization is using the 'compress_results' stage option, which is
not available in older versions of osbuild.
Signed-off-by: Tomáš Hozza <thozza@redhat.com>