Protect sensitive data from being loaded by the Metadata class

[Nicklas Nordborg]

The Metadata class can be used to load data from the database using reflection on the data layer objects. However, in #1784 it was discovered that some properties may contain sensitive data that has higher protection than other data (eg. change history logs). A solution was implemented as part of that ticket (see [6355]). The same protection should be applied to some other properties:

• Passwords (they are encrypted, but usually not readable by anyone)
• Internal file name (is for internal use only)

[Nicklas Nordborg]

(In [6356]) Fixes #1787: Protect sensitive data from being loaded by the Metadata class

[Nicklas Nordborg]

There is also some information in the FileServerData class that need protection:

• Password
• Client certificate
• Client certificate password

[Nicklas Nordborg]

(In [6486]) Fixes #1787: Protect sensitive data from being loaded by the Metadata class