tests: add keywords for a couple of FTP tests

tests/data/test505

@@ -1,4 +1,10 @@
 <testcase>
+<info>
+<keywords>
+FTP
+</keywords>
+</info>
+
 # Server-side
 <reply>
 </reply>

tests/data/test511

@@ -1,4 +1,10 @@
 <testcase>
+<info>
+<keywords>
+FTP
+</keywords>
+</info>
+
 #
 # Server-side
 <reply>

tests/data/test520

@@ -1,4 +1,10 @@
 <testcase>
+<info>
+<keywords>
+FTP
+</keywords>
+</info>
+
 #
 # Server-side
 <reply>

tests/data/test539

@@ -1,4 +1,10 @@
 <testcase>
+<info>
+<keywords>
+FTP
+</keywords>
+</info>
+
 #
 # Server-side
 <reply>

tests/data/test541

@@ -1,4 +1,10 @@
 <testcase>
+<info>
+<keywords>
+FTP
+</keywords>
+</info>
+
 # Server-side
 <reply>
 </reply>