Add SMB2 and CIFS magic numbers
requested to merge hoffmannrobert/kcoreaddons:work/hoffmannrobert/add_smb2_cifs_magic_numbers into master
Return KFileSystemType::Smb in determineFileSystemTypeImpl for these two magic numbers, too.
A vers=1.0 mounted cifs filesystem uses CIFS_MAGIC_NUMBER, from version 2 SMB2_MAGIC_NUMBER is used.