Refactor some certificate verification tests in preparation to adding

net/data/verify_certificate_chain_unittest/unknown-root.pem

 [Created by: generate-unknown-root.py]
 
 Certificate chain with 1 intermediate, but the root is not in trust store.
 Verification is expected to fail because the final intermediate (Intermediate)
 does not chain to a known root.
 
 Certificate:
     Data:
         Version: 3 (0x2)
         Serial Number: 1 (0x1)
@@ skipping 165 matching lines @@
 BgNVHR8EJTAjMCGgH6AdhhtodHRwOi8vdXJsLWZvci1jcmwvUm9vdC5jcmwwDgYD
 VR0PAQH/BAQDAgEGMA8GA1UdEwEB/wQFMAMBAf8wDQYJKoZIhvcNAQELBQADggEB
 AGkQ1cP/8GXGeVW+umt8f0miR7DX6SifFPYRatcf4xEwwdAMIYyzIZXB8y58ijT2
 1sdJmnVMkzXEiPe+1u3gdSIpTQ9ZgBobm6T9hq8edkQD+ULydB5rdPz6ZGczShST
 /IQfkgxirKrh8G8+CZDVZ2gqKJxfhimNSO8+pUhgCLXPrLr/utd9mo60YxDjFBIS
 iTcAQvtM5bcN5bgoW595SKrk7xfs6/HDgtlI7M309x+P4p7scaZ6zsD8FI9IF1YQ
 Aieq2RC7/G3i2LZmJwjlMU37JEUP2nqcjeWRDICRHkR4ASjK20CH2zgPGBqp/2iM
 A7KJguKA7jx34k6Fpc9yPyQ=
 -----END CERTIFICATE-----
 
+Certificate:
+    Data:
+        Version: 3 (0x2)
+        Serial Number: 1 (0x1)
+    Signature Algorithm: sha256WithRSAEncryption
+        Issuer: CN=BogusRoot
+        Validity
+            Not Before: Jan  1 12:00:00 2015 GMT
+            Not After : Jan  1 12:00:00 2016 GMT
+        Subject: CN=BogusRoot
+        Subject Public Key Info:
+            Public Key Algorithm: rsaEncryption
+                Public-Key: (2048 bit)
+                Modulus:
+                    00:a6:2e:77:a3:0d:0b:86:02:e4:79:46:6d:76:0e:
+                    de:ba:55:19:76:07:90:e5:7a:4b:9a:99:70:f2:91:
+                    f2:28:94:e7:e0:8b:aa:c4:a5:c1:82:36:d8:30:be:
+                    84:43:45:ae:2a:60:e7:fe:d4:a0:a1:a7:e9:30:56:
+                    d0:c9:5d:f8:5f:86:9c:ba:c9:ad:cc:29:77:15:0c:
+                    e8:7b:78:52:42:ec:69:db:db:38:d6:f5:25:75:50:
+                    6f:21:a0:9a:b2:4e:3a:33:6c:47:60:b2:a4:e7:ec:
+                    bc:c0:9f:d7:46:1b:bb:82:43:2a:22:6d:fb:65:0d:
+                    b5:cf:48:b9:a6:e3:2b:26:77:32:db:a6:80:b6:a7:
+                    63:f5:b9:d7:bf:f3:37:bd:2b:88:15:b5:50:06:0c:
+                    c9:6f:05:2b:97:ac:ff:01:d9:9e:55:b8:2d:90:62:
+                    a4:38:d4:d3:19:87:8f:b0:dd:88:4d:ca:19:f3:c9:
+                    2f:95:22:a8:19:be:98:38:6d:0f:17:65:d7:ee:5b:
+                    82:73:f8:c5:28:43:76:96:a6:ef:00:9c:5e:d0:9d:
+                    cc:52:dc:c8:6c:d6:4a:8e:2c:5a:c0:9b:e0:b4:1b:
+                    f4:5f:43:84:b7:ad:7d:d1:07:c6:79:16:d8:01:c2:
+                    73:e7:ad:dc:4c:d4:a5:bc:ab:99:60:6d:18:34:14:
+                    ed:07
+                Exponent: 65537 (0x10001)
+        X509v3 extensions:
+            X509v3 Subject Key Identifier: 
+                60:21:11:AF:90:99:E9:F8:9A:0B:80:16:9C:63:C3:DC:45:08:84:91
+            X509v3 Authority Key Identifier: 
+                keyid:60:21:11:AF:90:99:E9:F8:9A:0B:80:16:9C:63:C3:DC:45:08:84:91
+
+            Authority Information Access: 
+                CA Issuers - URI:http://url-for-aia/BogusRoot.cer
+
+            X509v3 CRL Distribution Points: 
+
+                Full Name:
+                  URI:http://url-for-crl/BogusRoot.crl
+
+            X509v3 Key Usage: critical
+                Certificate Sign, CRL Sign
+            X509v3 Basic Constraints: critical
+                CA:TRUE
+    Signature Algorithm: sha256WithRSAEncryption
+         97:aa:1c:16:64:05:60:ea:e0:5b:ae:7e:31:f3:6e:04:07:fe:
+         ba:34:6d:fd:b3:c9:74:d1:f8:b4:da:c2:97:1e:00:da:05:b6:
+         08:de:e3:8e:6e:5e:a9:9b:15:62:41:0b:2f:d2:bc:24:4a:47:
+         e9:7a:0c:6b:ba:c9:04:7c:82:ea:c5:89:5c:03:6f:8a:e6:a1:
+         13:4c:02:1a:5b:2e:ae:48:8b:16:f5:6d:01:89:89:66:29:06:
+         40:49:fe:b9:51:19:9e:ea:6d:76:ce:a7:78:7e:72:bf:04:4c:
+         bf:f6:17:b0:bc:79:3e:67:47:89:ec:d9:07:40:55:6e:5b:7c:
+         79:6e:7f:97:e9:1b:d3:df:b6:54:e5:53:44:32:e2:39:17:ea:
+         17:be:6c:82:8a:b6:c2:6a:b4:c5:b7:8c:6d:38:34:b4:b8:27:
+         66:1f:4f:70:1d:65:77:6c:73:d8:69:24:6f:06:09:d4:f9:a9:
+         7a:eb:47:cb:9b:3e:ec:42:89:2e:f4:2b:20:36:f1:fc:70:e2:
+         3b:83:0a:e0:3a:04:1e:bf:53:cb:b6:ca:fe:2f:25:d5:c6:aa:
+         71:39:a9:8e:25:4a:75:bb:15:fc:29:4f:ba:d6:a9:02:c7:8d:
+         d8:06:48:aa:6d:0b:34:bd:36:19:ea:87:a9:50:e5:a8:d8:31:
+         73:a2:30:44
+-----BEGIN TRUST_ANCHOR_UNCONSTRAINED-----
+MIIDeTCCAmGgAwIBAgIBATANBgkqhkiG9w0BAQsFADAUMRIwEAYDVQQDDAlCb2d1
+c1Jvb3QwHhcNMTUwMTAxMTIwMDAwWhcNMTYwMTAxMTIwMDAwWjAUMRIwEAYDVQQD
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+DQuGAuR5Rm12Dt66VRl2B5DlekuamXDykfIolOfgi6rEpcGCNtgwvoRDRa4qYOf+
+1KChp+kwVtDJXfhfhpy6ya3MKXcVDOh7eFJC7Gnb2zjW9SV1UG8hoJqyTjozbEdg
+sqTn7LzAn9dGG7uCQyoibftlDbXPSLmm4ysmdzLbpoC2p2P1ude/8ze9K4gVtVAG
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+BwEBBDAwLjAsBggrBgEFBQcwAoYgaHR0cDovL3VybC1mb3ItYWlhL0JvZ3VzUm9v
+dC5jZXIwMQYDVR0fBCowKDAmoCSgIoYgaHR0cDovL3VybC1mb3ItY3JsL0JvZ3Vz
+Um9vdC5jcmwwDgYDVR0PAQH/BAQDAgEGMA8GA1UdEwEB/wQFMAMBAf8wDQYJKoZI
+hvcNAQELBQADggEBAJeqHBZkBWDq4FuufjHzbgQH/ro0bf2zyXTR+LTawpceANoF
+tgje445uXqmbFWJBCy/SvCRKR+l6DGu6yQR8gurFiVwDb4rmoRNMAhpbLq5Iixb1
+bQGJiWYpBkBJ/rlRGZ7qbXbOp3h+cr8ETL/2F7C8eT5nR4ns2QdAVW5bfHluf5fp
+G9PftlTlU0Qy4jkX6he+bIKKtsJqtMW3jG04NLS4J2YfT3AdZXdsc9hpJG8GCdT5
+qXrrR8ubPuxCiS70KyA28fxw4juDCuA6BB6/U8u2yv4vJdXGqnE5qY4lSnW7Ffwp
+T7rWqQLHjdgGSKptCzS9Nhnqh6lQ5ajYMXOiMEQ=
+-----END TRUST_ANCHOR_UNCONSTRAINED-----
+
 -----BEGIN TIME-----
 MTUwMzAyMTIwMDAwWg==
 -----END TIME-----
 
 -----BEGIN VERIFY_RESULT-----
 RkFJTA==
 -----END VERIFY_RESULT-----