Add ocp-29073-internalis testcase

[sergiordlr]

Testcase to check that imagestreams and imagestreams tags pointing to images stored in the internal registry can be migrated.

1. Create a namespace
2. Mirror an alpine image to internal registry, creating the imagestream in the namespace
3. Mirror a busybox image to internal registry, creating a new version of the same imagestream.
4. Create several imagestream tags pointing to those 2 images.
5. Create pods that will use those imagestream tags. (this step is skipped because of BZ https://bugzilla.redhat.com/show_bug.cgi?id=1820250, once the bug is fixed it will be enabled again)
6. Migrate.
7. Verify that the migrated namespace is ok.