tests: use %TESTNUMBER instead of fixed number

This makes the tests easier to copy and relocate to other test numbers
without having to update content.

Closes #6738

tests/data/test2

@@ -29,7 +29,7 @@ http
 HTTP GET with user and password
  </name>
  <command>
- -u fake:user http://%HOSTIP:%HTTPPORT/2
+ -u fake:user http://%HOSTIP:%HTTPPORT/%TESTNUMBER
 </command>
 </client>
 
@@ -37,15 +37,12 @@ HTTP GET with user and password
 # Verify data after the test has been "shot"
 <verify>
 <protocol>
-GET /2 HTTP/1.1
+GET /%TESTNUMBER HTTP/1.1
 Host: %HOSTIP:%HTTPPORT
 Authorization: Basic ZmFrZTp1c2Vy
 User-Agent: curl/%VERSION
 Accept: */*
 
 </protocol>
-<data>
-[insert full protocol verifiction dump here]
-</data>
 </verify>
 </testcase>