Passwd_Driver: Fix password comparison when show_encryption is true

Stripping the encryption type from a password when show_encryption is
true results in _comparePasswords() always raising an exception as the
parameter is also passed to Horde_Auth::getCryptedPassword().
Horde_Auth: SHA256 hashes are 32 bytes long
SqliteTest: Fix 'access to undeclared static property' error
AuthTest: Add support for testing show_encryption param
Horde_Auth_Testcase: Add SSHA256 test data
Merge remote-tracking branch 'atj/master'
[mms] Fix parsing salted SHA256 entries (Adam James <adam.james@transitiv.co.uk>).