runtests: make stripfile work on stdout as well

... and have test 1700 use that to strip out the nghttpx server: headers

tests/FILEFORMAT

@@ -426,8 +426,9 @@ have a text/binary difference.
 Variables are substituted as in the <command> section.
 </file>
 <stripfile>
-One perl op per line that operates on the file before being compared. This is
-pretty advanced. Example: "s/^EPRT .*/EPRT stripped/"
+One perl op per line that operates on the output file or stdout before being
+compared with what is stored in the test file. This is pretty
+advanced. Example: "s/^EPRT .*/EPRT stripped/"
 </stripfile>
 <upload>
 the contents of the upload data curl should have sent

tests/data/test1700

@@ -46,7 +46,7 @@ http2
 HTTP/2 GET with Upgrade:
  </name>
  <command>
-http://%HOSTIP:9015/1700 --http2 http://%HOSTIP:9015/17000001
+http://%HOSTIP:%HTTP2PORT/1700 --http2 http://%HOSTIP:%HTTP2PORT/17000001
 </command>
 </client>
 
@@ -60,11 +60,11 @@ http://%HOSTIP:9015/1700 --http2 http://%HOSTIP:9015/17000001
 </strip>
 <protocol>
 GET /1700 HTTP/1.1
-Host: %HOSTIP:9015
+Host: %HOSTIP:%HTTP2PORT
 Accept: */*
 
 GET /17000001 HTTP/1.1
-Host: %HOSTIP:9015
+Host: %HOSTIP:%HTTP2PORT
 Accept: */*
 
 </protocol>
@@ -81,7 +81,7 @@ accept-ranges: bytes
 content-length: 6
 content-type: text/html
 funny-head: yesyes
-server: nghttpx nghttp2/1.12.0-DEV
+server: cut-out
 via: 1.1 nghttpx
 
 -foo-
@@ -89,10 +89,13 @@ HTTP/2 200
 date: Thu, 09 Nov 2010 14:49:00 GMT
 content-length: 6
 content-type: text/html
-server: nghttpx nghttp2/1.12.0-DEV
+server: cut-out
 via: 1.1 nghttpx
 
 -maa-
 </stdout>
+<stripfile>
+s/^server:.*/server: cut-out
/
+</stripfile>
 </verify>
 </testcase>

tests/http2-server.pl

@@ -72,4 +72,4 @@ my $cmdline="$nghttpx --backend=127.0.0.1,8990 ".
     "--pid-file=$pidfile ".
     "--errorlog-file=$logfile";
 print "RUN: $cmdline\n" if($verbose);
-system("$cmdline");
+system("$cmdline 2>/dev/null");

tests/runtests.pl

@@ -3841,6 +3841,23 @@ sub singletest {
         # verify redirected stdout
         my @actual = loadarray($STDOUT);
 
+        # what parts to cut off from stdout
+        my @stripfile = getpart("verify", "stripfile");
+
+        foreach my $strip (@stripfile) {
+            chomp $strip;
+            my @newgen;
+            for(@actual) {
+                eval $strip;
+                if($_) {
+                    push @newgen, $_;
+                }
+            }
+            # this is to get rid of array entries that vanished (zero
+            # length) because of replacements
+            @actual = @newgen;
+        }
+
         # variable-replace in the stdout we have from the test case file
         @validstdout = fixarray(@validstdout);