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/test189

@@ -10,7 +10,7 @@ HTTP GET
 <reply>
 <data>
 HTTP/1.1 301 OK swsbounce
-Location: /189
+Location: /%TESTNUMBER
 Content-Length: 3
 
 OK
@@ -25,7 +25,7 @@ Actual content
 
 <datacheck>
 HTTP/1.1 301 OK swsbounce
-Location: /189
+Location: /%TESTNUMBER
 Content-Length: 3
 
 HTTP/1.1 200 OK 
@@ -45,20 +45,20 @@ http
 HTTP GET with resume and redirect (to a page that doesn't resume)
  </name>
  <command>
-http://%HOSTIP:%HTTPPORT/189 -C 50 -L
+http://%HOSTIP:%HTTPPORT/%TESTNUMBER -C 50 -L
 </command>
 </client>
 
 # Verify data after the test has been "shot"
 <verify>
 <protocol>
-GET /189 HTTP/1.1
+GET /%TESTNUMBER HTTP/1.1
 Host: %HOSTIP:%HTTPPORT
 Range: bytes=50-
 User-Agent: curl/%VERSION
 Accept: */*
 
-GET /189 HTTP/1.1
+GET /%TESTNUMBER HTTP/1.1
 Host: %HOSTIP:%HTTPPORT
 Range: bytes=50-
 User-Agent: curl/%VERSION