Add addon ISOs if addons being tested
assert_and_click: move the mouse back to where it was before
- prepare to split off testcase 'get_to_yast' from backend code
- include last screen content in debug output when failing in expect_3270
- don't use $LIST_SEPARATOR.  use join("\n",@...) or Dumper(@...) instead.
- move test case from s390x.pm to get_to_yast.pm
- remove trailing whitespace
- linuxrc_prompt and ftpboot_menu are also gone to get_to_yast.pm