Adding plugin tests. (#385)

* Adding plugin tests.

* Fixing some python 2/3 incompatibilities.

lemur/tests/vectors.py

@@ -190,6 +190,61 @@ XKxcRgm/Va4QMEAnec0qXfdTVJaJiAW0bdKwKRRrrbwcTdNRGibdng==
 -----END RSA PRIVATE KEY-----
 """
 
+INTERNAL_CERTIFICATE_A_STR = b"""
+-----BEGIN CERTIFICATE-----
+MIIDazCCAlOgAwIBAgIBATANBgkqhkiG9w0BAQsFADB5MQswCQYDVQQGEwJVUzET
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+L0Ew8hy0GG3nZ6uXLW7q
+-----END CERTIFICATE-----
+"""
+
+
+INTERNAL_PRIVATE_KEY_A_STR = b"""
+-----BEGIN RSA PRIVATE KEY-----
+MIIEpQIBAAKCAQEAtkyvL6EqSgYSJX11635Hb8FBG/8Wey6C2KtG7M+GXvGCsSmf
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+3i841gR9+cwA0S1hy7fC0PDmTo0xC91JocwesPQ023MmECPfu6Frzog=
+-----END RSA PRIVATE KEY-----
+"""
+
 
 CSR_STR = b"""
 -----BEGIN CERTIFICATE REQUEST-----