Remove test user need logout firstly

[lemon-suse]

In x11, to remove a user account need logout the user firstly. So update the switch user test from 'login bernhard -> switch to test -> switch to bernhard ->logout bernhard' to 'login bernhard -> switch to test -> logout test'.

• Related ticket: https://progress.opensuse.org/issues/102963
• Needles: N/A
• Verification run: https://openqa.nue.suse.com/tests/7897906#

[chcao]

LGTM

[GraceWang571]

So update the switch user test from 'login bernhard -> switch to test -> switch to bernhard ->logout bernhard' to 'login bernhard -> switch to test -> logout test'.

This looks weird. They are obviously not equal.
Besides, change_password failed after this PR merged. Can you please take a look? https://openqa.opensuse.org/tests/2101442#step/change_password/66

[lemon-suse]

So update the switch user test from 'login bernhard -> switch to test -> switch to bernhard ->logout bernhard' to 'login bernhard -> switch to test -> logout test'.

This looks weird. They are obviously not equal. Besides, change_password failed after this PR merged. Can you please take a look? https://openqa.opensuse.org/tests/2101442#step/change_password/66

I will split this part as two, migration and desktop test, for migration need logout test after switch user, while for desktop still need to switch back to bernhard. I will file a PR for this.