Land rapid7#4198, @trosen-r7's fixes to XML import.

Author: jvennix-r7

lib/msf/core/db_manager/import.rb

@@ -302,6 +302,9 @@ def import_filetype_detect(data)
         when /MetasploitV4/
           @import_filedata[:type] = "Metasploit XML"
           return :msf_xml
+        when /MetasploitV5/
+          @import_filedata[:type] = "Metasploit XML"
+          return :msf_xml
         when /netsparker/
           @import_filedata[:type] = "NetSparker XML"
           return :netsparker_xml