tests: add test for bug #1327 (dns cache timeout)

Fix for bug #1303 (030a2b8cb) was not complete.
libcurl still pruned DNS entries added manually
after detecting a dead connection. This test
checks such behavior.

tests/data/Makefile.am

@@ -124,6 +124,7 @@ test1416 test1417 \
 \
 test1500 test1501 test1502 test1503 test1504 test1505 test1506 test1507 \
 test1508 test1509 test1510 test1511 test1512 test1513 test1514 test1515 \
+test1516 \
 \
 test1900 test1901 test1902 test1903 \
 \

tests/data/test1516

@@ -0,0 +1,58 @@
+<testcase>
+
+<info>
+<keywords>
+HTTP
+multi
+FAILURE
+resolve
+</keywords>
+</info>
+
+<reply>
+# Close the connection after the first request but don't tell the client to do
+# so! When starting the second request it'll detect a dead connection and must
+# not clean the DNS entries added manually.
+<data1>
+HTTP/1.1 200 OK
+Date: Thu, 03 Feb 2014 17:04:00 GMT
+Server: test-server/fake swsclose
+Content-Type: text/html
+Content-Length: 6
+
+hello
+</data1>
+<data2>
+HTTP/1.1 200 OK
+Date: Thu, 03 Feb 2014 17:04:02 GMT
+Server: test-server/fake swsclose
+Connection: close
+Content-Type: text/html
+Content-Length: 6
+
+hello
+</data2>
+</reply>
+
+<client>
+<server>
+http
+</server>
+<tool>
+lib1515
+</tool>
+<name>
+caching of manual libcurl DNS entries after dead connection
+</name>
+<command>
+/path/1516 %HOSTIP %HTTPPORT
+</command>
+</client>
+
+<verify>
+<errorcode>
+0
+</errorcode>
+</verify>
+
+</testcase>