1) In FIPS mode, Classic RDP security is not allowed at all.
2) In FIPS mode xrdp-keygen creates an empty file
3) Documentation wording improved around the security_level setting
4) Logging improved around the security negotiation
5) Warnings now generated if Classic RDP security is negotiated
This allows the `xrdp` part of the path `/etc/xrdp` where config files
are placed to be customizable. This change is useful when trying the
stable version and the devel version alternately.