Port osbuild/images v0.33.0 with dot-notation to composer

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>

test/cases/ostree-ng.sh

@@ -125,7 +125,7 @@ case "${ID}-${VERSION_ID}" in
         CONTAINER_TYPE=iot-container
         INSTALLER_TYPE=iot-installer
         OSTREE_REF="fedora/${VERSION_ID}/${ARCH}/iot"
-        OSTREE_OSNAME=fedora
+        OSTREE_OSNAME=fedora-iot
         OS_VARIANT="fedora-unknown"
         EMBEDED_CONTAINER="false"
         DIRS_FILES_CUSTOMIZATION="true"