Convert (most of) the test data files into genuine XML. A handful still

are not, due mainly to the lack of support for XML character entities
(e.g. & => & ).  This will make it easier to validate test files using
tools like xmllint, as well as edit and view them using XML tools.

tests/data/test522

@@ -1,3 +1,4 @@
+<testcase>
 <info>
 <keywords>
 HTTP
@@ -9,7 +10,7 @@ CURLOPT_PORT
 #
 # Server-side
 <reply>
-<data nocheck=1>
+<data nocheck="1">
 HTTP/1.1 200 OK
 Date: Thu, 09 Nov 2010 14:49:00 GMT
 Server: test-server/fake
@@ -56,3 +57,4 @@ Accept: */*
 hello
 </stdout>
 </verify>
+</testcase>