Multiple certificates with the same subjectdn is still buggy

[jpsikorra]

If multiple certificates with the same subjectdn are added to the store and used to verify, this can still fail based on the order they were placed in the store. I tried to fix this in #198.

Here is a change to one of the jruby_openssl test cases (/jruby-openssl/src/test/ruby/x509/test_x509store.rb:424:in `test_verify_same_subject_ca'
) that will reproduce the error:

--- a/src/test/ruby/x509/test_x509store.rb
+++ b/src/test/ruby/x509/test_x509store.rb
@@ -411,10 +411,10 @@ class TestX509Store < TestCase
     ee4_cert = issue_cert(@ee4, @dsa2, 20, ee_exts, ca4_cert, @rsa4, not_before: now - 60, not_after: now + 1800)

     cert_store = OpenSSL::X509::Store.new
-    cert_store.add_cert ca1_cert
-    cert_store.add_cert ca2_cert
-    cert_store.add_cert ca3_cert
     cert_store.add_cert ca4_cert
+    cert_store.add_cert ca3_cert
+    cert_store.add_cert ca2_cert
+    cert_store.add_cert ca1_cert

     ok = cert_store.verify(ee1_cert)
     assert_equal 'certificate signature failure', cert_store.error_string

I just reversed the order in which the ca certificates are added to the store and the test will fail.