added a test case for RETR that doesn't get the size in the 150-reply

# Server-side

<reply>

<data>

this is file contents

</data>

</reply>

# Client-side

<client>

 <name>

FTP download without size in RETR string

 </name>

 <command>

ftp://%HOSTIP:%FTPPORT/blalbla/lululul/137

</command>

<file name="log/ftpserver.cmd">

RETRNOSIZE

</file>

</test>

# Verify data after the test has been "shot"

<verify>

<protocol>

USER anonymous

PASS curl_by_daniel@haxx.se

PWD

CWD blalbla/lululul

EPSV

TYPE I

SIZE 137

RETR 137

</protocol>

</verify>