Bump kuttl to 0.20.0

It allows again for more granularity in JUnitXML reports.
The other changes are mainly dependency bumps, plus an way
to impersonate a different users. So no breaking changes
are expected from this bump.

devsetup/roles/download_tools/defaults/main.yaml

@@ -1,6 +1,6 @@
 ---
 # kuttl version to use (must be specific version)
-kuttl_version: 0.17.0
+kuttl_version: 0.20.0
 
 # Released version of the opm package (can be set to 'latest')
 opm_version: latest