Update window_system to make ensure permission

[yuanren10]

Add ensure_serialdev_permissions into window_system to
make user Berhard and /dev/ttyS0 belongs to the same
group.

Reference:
Before update test run
After update test run

[yuanren10]

@okurz @rwx788 This is a workaround way to solve write permission to /dev/ttyS0, we have discussed in #5492 . modified code may can use "x11/x11_setup" to replace, but I try to don't modify "main_common.pm".
We have to deal with permission issue on Tumbleweed.
Consider all situation we had discussed, I choose to update in this way, although I still recommend to move "consoletest_setup" into create_hdd_* :）
But this PR wouldn't cause any crash at least.

[yuanren10]

As for #5492 I think it can be merged. Because the "hostname" case is really overloaded.
As for #5539 and #5494 is still waiting have the right group permission as above said. I will update pull a new commit to update these PR once this PR merged. So, in case of mess up, let's just start with this one and #5492 please.

[yuanren10]

@rwx788 Please revert and close this PR. You did a great job in #5564 , "console/system_prepare" had done what I want to. So, we do not need to check permission again in "window_system".
Verfication Run:
create_hdd_gnome
window_system