Use strict FTP multiline parsing

Fixes situations where FTP server replies with e.g.
250-
550
250

Author: AliveDevil

defaults/src/main/resources/default.properties

@@ -258,7 +258,7 @@ ftp.datachannel.verify=false
 ftp.datachannel.epsv=false
 ftp.socket.buffer=0
 
-ftp.parser.multiline.strict=false
+ftp.parser.multiline.strict=true
 ftp.parser.reply.strict=false
 ftp.parser.mlsd.perm.enable=false