Fix users clients

[joseivanlopez]

Problem

The dialog for configuring the root password is shown even though the option "Use password for root" was selected. This is happening because firstboot writes/reads from the system in each step. Because that, the client for root password is not able to detect if the user password was used for root. Note at that point the plain passwords are not available anymore to compare them.

• https://bugzilla.suse.com/show_bug.cgi?id=1188068

Solution

The user client now remembers the plain user and root passwords. This makes possible to fix the issue and also to fill the password fields, giving the exactly same user experience as in the regular installation.

Testing

• Added unit tests.
• Manually tested.

[coveralls]

Pull Request Test Coverage Report for Build 1015081779

• 56 of 56 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+2.6%) to 15.618%

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Totals
Change from base Build 986530643:	2.6%
Covered Lines:	206
Relevant Lines:	1319

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💛 - Coveralls

[dgdavid]

LGTM

[yast-bot]

✔️ Public Jenkins job #50 successfully finished
✔️ Created OBS submit request #905297

[yast-bot]

✔️ Internal Jenkins job #33 successfully finished
✔️ Created IBS submit request #244627