Fix a bug in OkHostnameVerifier wildcard handling.

Wildcard domain name patterns of the form *.remainder are supposed to
match domain names that exactly match the remainder. Due to a bug,
the match was not exact but rather a prefix match: domain names
starting with the remainder would match too.

This CL fixes the issue.

(cherry picked from commit a03ec4ced2b11f9eae6cbeeedb1db2b1b29fafb1)

Bug: 18432707
Change-Id: Ie40b71a26df1ac2a972341e7b3b40dd9cf38e8b1

Author: Alex Klyubin

src/main/java/com/squareup/okhttp/internal/tls/OkHostnameVerifier.java

@@ -162,7 +162,7 @@ public boolean verifyHostName(String hostName, String cn) {
       return hostName.equals(cn);
     }
 
-    if (cn.startsWith("*.") && hostName.regionMatches(0, cn, 2, cn.length() - 2)) {
+    if (cn.startsWith("*.") && hostName.equals(cn.substring(2))) {
       return true; // "*.foo.com" matches "foo.com"
     }
 

src/test/java/com/squareup/okhttp/internal/tls/HostnameVerifierTest.java

@@ -293,6 +293,7 @@ public final class HostnameVerifierTest {
     assertTrue(verifier.verify("www.foo.com", session));
     assertTrue(verifier.verify("\u82b1\u5b50.foo.com", session));
     assertFalse(verifier.verify("a.b.foo.com", session));
+    assertFalse(verifier.verify("foo.com.au", session));
   }
 
   @Test public void verifyWilcardCnOnTld() throws Exception {