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/test1

@@ -1,3 +1,4 @@
+<testcase>
 <info>
 <keywords>
 HTTP
@@ -20,7 +21,7 @@ Connection: close
 Content-Type: text/html
 Funny-head: yesyes
 
-<foo>
+-foo-
 </data>
 </reply>
 
@@ -51,3 +52,4 @@ Accept: */*
 
 </protocol>
 </verify>
+</testcase>