[TASK] Reports module uses internal data of salted passwords

Reports module changes from issue #30695 introduced a check
for the saltedpasswords extension and a report about users,
whose passwords are not protected by the saltedpasswords.
That check queries database directly and uses internal
knowledge of saltedpasswords about marking the password
with certain characters. This can break reports module
if saltedpasswords adds a new scheme to salt passwords.
Only saltedpasswords should know about those prefixes.
Other extensions should use the API of saltedpasswords
to query the information.

Change-Id: Iec27610c2227ed15537f37b53e1b26443b5a276f
Resolves: #32136
Releases: 4.7, 4.6, 4.5
Reviewed-on: http://review.typo3.org/6953
Reviewed-by: Oliver Hader
Tested-by: Oliver Hader
Reviewed-by: Markus Klein
Tested-by: Markus Klein
Reviewed-by: Steffen Ritter
Tested-by: Steffen Ritter