CB-17348 Create e2e test for saltuser password rotation

[Bajzathd]

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Verify the changed password and password expiry dates on FreeIPA, Datalake and Datahub clusters with the following steps:

• Set the password change date to a past date (on new clsuters that would be the current day by default)
• Get the saltuser line from the shadow file and save it as a reference
• Call the rotate salt password endpoint
• Verify that the saltuser's line in the shadow file was changed
• Verify that the saltuser's password change date is set to today