hostip: resolve *.localhost to 127.0.0.1/::1

Following the footsteps of other clients like Firefox/Chrome.  RFC 6761
says clients SHOULD do this.

Add test 389 to verify.

Reported-by: TheKnarf on github
Fixes #9192
Closes #9296

tests/data/test389

@@ -0,0 +1,57 @@
+<testcase>
+<info>
+<keywords>
+HTTP
+.localhost
+</keywords>
+</info>
+
+#
+# Server-side
+<reply>
+<data>
+HTTP/1.1 200 OK
+Date: Tue, 09 Nov 2010 14:49:00 GMT
+Server: test-server/fake
+Last-Modified: Tue, 13 Jun 2000 12:10:00 GMT
+ETag: "21025-dc7-39462498"
+Accept-Ranges: bytes
+Content-Length: 6
+Connection: close
+Content-Type: text/html
+Funny-head: yesyes
+
+-foo-
+</data>
+</reply>
+
+#
+# Client-side
+<client>
+<server>
+http
+</server>
+ <name>
+*.localhost is a local host
+ </name>
+ <command>
+http://curlmachine.localhost:%HTTPPORT/%TESTNUMBER
+</command>
+# Ensure that we're running on localhost
+<precheck>
+perl -e "print 'Test requires default test server host' if ( '%HOSTIP' ne '127.0.0.1' );"
+</precheck>
+</client>
+
+#
+# Verify data after the test has been "shot"
+<verify>
+<protocol>
+GET /%TESTNUMBER HTTP/1.1
+Host: curlmachine.localhost:%HTTPPORT
+User-Agent: curl/%VERSION
+Accept: */*
+
+</protocol>
+</verify>
+</testcase>