tests: add 3 new HTTP/2 test cases, plus https: support for nghttpx

- a simple https get
- a simple https post
- a multi get of 4 requests and check that same connection was used

Closes #10114

tests/data/test2400

@@ -0,0 +1,64 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+HTTP GET
+HTTP/2
+HTTPS
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<data nocheck="yes">
+HTTP/1.1 200 OK
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Content-Length: 6
+Connection: close
+Content-Type: text/html
+Funny-head: yesyes
+
+-foo-
+</data>
+</reply>
+
+#
+# Client-side
+<client>
+<features>
+debug
+h2c
+SSL
+</features>
+<server>
+http
+http/2
+</server>
+ <name>
+HTTP/2 GET
+ </name>
+<setenv>
+</setenv>
+ <command>
+-k --http2 "https://%HOSTIP:%HTTP2TLSPORT/%TESTNUMBER"
+</command>
+
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<stdout crlf="yes">
+HTTP/2 200 
+date: Tue, 09 Nov 2010 14:49:00 GMT
+content-length: 6
+content-type: text/html
+funny-head: yesyes
+server: nghttpx
+via: 1.1 nghttpx
+
+-foo-
+</stdout>
+</verify>
+</testcase>