tests: added missing HTTP NTLM auth keywords

Also, removed an unneeded strippart

tests/data/test150

 <testcase>
+<info>
+<keywords>
+HTTP
+HTTP GET
+HTTP NTLM auth
+</keywords>
+</info>
 
 <!-- Server-side -->
 <reply>

tests/data/test155

@@ -3,6 +3,7 @@
 <keywords>
 HTTP
 HTTP PUT
+HTTP NTLM auth
 </keywords>
 </info>
 

tests/data/test159

@@ -3,6 +3,7 @@
 <keywords>
 HTTP
 HTTP GET
+HTTP NTLM auth
 </keywords>
 </info>
 

tests/data/test176

@@ -3,6 +3,7 @@
 <keywords>
 HTTP
 HTTP POST
+HTTP NTLM auth
 </keywords>
 </info>
 

tests/data/test553

@@ -44,8 +44,6 @@ http://%HOSTIP:%HTTPPORT/path/553
 <strip>
 ^User-Agent: curl/.*
 </strip>
-# We strip off a large chunk of the type-2 NTLM message since it depends on
-# the local host name and thus differs on different machines!
 <protocol nonewline="yes">
 POST /path/553 HTTP/1.1
 Host: %HOSTIP:%HTTPPORT