Changed some FTP tests to validate the format of the PORT and EPRT commands

sent by curl, if not the addresses themselves.

tests/data/test531

@@ -37,10 +37,10 @@ don't upload this
 
 # Verify data after the test has been "shot"
 <verify>
+# Strip all valid kinds of PORT and EPRT that curl can send
 <strip>
-^PORT .*
-^EPRT .*
-^LPRT .*
+^PORT \d{1,3},\d{1,3},\d{1,3},\d{1,3},\d{1,3},\d{1,3}
+^EPRT \|1\|\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\|\d{1,5}\|
 </strip>
 <protocol>
 USER anonymous