[TASK] Install steps: Load saltedpasswords and rsaauth

Change factory configuration to include settings for saltedpasswords
and rsaauth so they are loaded by default if installation is
completed. PhpPass is used as default salt algorithm since this
is a better than salted md5 and has no additional system
depencies.

Resolves: #49694
Related: #49162
Releases: 6.2

Change-Id: Ib01628dc2cb80082e8dbd3a5f6c1f24cc5aae589
Reviewed-on: https://review.typo3.org/21924
Reviewed-by: Susanne Moog
Tested-by: Susanne Moog
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer