pki library: Add CertIssuerSourceNSS that retrieves intermediate certs from NSS.

net/data/cert_issuer_source_static_unittest/i2.pem

 Generated by ./generate-certs.py.
 Refer to generator script docstring for details.
 Certificate:
     Data:
         Version: 3 (0x2)
         Serial Number: 4 (0x4)
     Signature Algorithm: sha256WithRSAEncryption
         Issuer: CN=Root
         Validity
             Not Before: Jan  1 12:00:00 2015 GMT
             Not After : Jan  1 12:00:00 2016 GMT
         Subject: CN=I2
         Subject Public Key Info:
             Public Key Algorithm: rsaEncryption
                 Public-Key: (2048 bit)
                 Modulus:
-                    00:c5:2a:06:f1:73:72:43:37:0a:2f:24:24:32:6b:
-                    04:fd:5d:0e:17:b6:3b:37:f0:59:09:10:39:f0:ee:
-                    cd:9b:43:e0:9d:e9:63:6e:05:42:5e:f8:b8:26:78:
-                    6b:9c:bd:0c:cc:85:8b:10:e8:7b:ef:03:8f:6e:84:
-                    fe:30:64:f7:21:78:3e:2b:e4:2e:d2:51:4a:e7:92:
-                    e3:44:c2:eb:cb:b3:fe:7c:44:6e:17:e0:cc:7b:39:
-                    4d:71:59:9b:d6:e8:8d:26:bd:49:fa:3e:b0:27:96:
-                    36:2c:f0:61:ca:a9:c0:00:ed:85:70:69:64:b4:81:
-                    71:69:a8:52:74:34:d7:61:6c:7c:84:9a:de:82:07:
-                    3b:18:dc:85:35:11:b7:0b:3a:89:59:1d:23:62:48:
-                    91:cf:60:0f:c4:ea:57:ca:42:8e:e8:52:1a:13:56:
-                    2d:1c:5b:70:3a:64:2f:a1:b4:d7:de:51:19:57:63:
-                    6d:10:c8:a3:1b:1d:92:96:dc:37:fa:8b:60:3a:67:
-                    7c:61:0b:24:15:54:68:e2:b0:74:b3:1a:cd:33:4c:
-                    3c:49:e1:56:eb:7d:59:07:eb:87:7a:bc:6f:f4:e8:
-                    3b:2b:c6:d0:e6:ae:7a:df:04:d4:99:27:7d:4f:a7:
-                    22:ea:7d:6a:ff:69:1a:b8:6e:f5:4a:18:0f:98:1a:
-                    22:27
+                    00:bd:84:dd:82:37:cb:c8:69:8a:c2:c6:ff:38:f7:
+                    85:93:9e:22:d5:b8:94:12:3b:d9:9f:49:70:ef:ff:
+                    39:58:fc:e7:36:32:18:37:d4:2b:d9:4e:4e:67:60:
+                    ee:2c:28:d0:4f:66:23:cd:c1:f0:75:f5:54:0e:51:
+                    a5:f0:fa:9c:bd:42:5d:02:3a:62:60:83:b8:e5:fe:
+                    cd:bc:ad:35:b7:9e:09:ec:3a:81:51:b7:46:56:2d:
+                    90:bb:e5:4a:4f:6a:c6:be:39:79:b6:31:99:1b:c4:
+                    d0:a1:94:dc:e5:51:8e:9d:a9:c5:d8:91:f9:5c:76:
+                    3a:09:d2:8f:0c:24:3a:ff:91:4c:c6:c9:c7:36:53:
+                    cc:78:eb:fc:00:25:fd:5f:b3:c0:95:10:91:3d:43:
+                    fe:31:b6:b3:84:e9:ec:5f:1b:5a:77:a7:25:29:1a:
+                    7a:71:d9:7a:62:85:45:c3:51:da:ed:79:a5:41:7d:
+                    0b:49:3e:2b:51:5e:99:33:1f:1c:5a:52:51:6b:07:
+                    c5:5a:0b:4b:b6:e1:6c:43:07:f2:b2:65:6e:9d:77:
+                    a9:2a:b6:88:7b:a9:d9:97:6b:65:f9:be:4e:39:31:
+                    4c:a0:2d:06:18:de:53:7c:bf:80:64:cc:2b:7a:b0:
+                    2b:76:03:c4:40:a6:53:f1:dc:74:87:fb:c5:d8:2f:
+                    f5:ef
                 Exponent: 65537 (0x10001)
         X509v3 extensions:
             X509v3 Subject Key Identifier: 
-                FD:5E:CC:AF:B7:44:FD:EA:B3:2A:50:1D:1E:A0:2B:00:1C:E7:D2:84
+                B7:FB:54:77:0C:76:74:B0:72:84:2F:4E:AF:24:1F:CA:62:8D:99:61
             X509v3 Authority Key Identifier: 
-                keyid:53:00:1D:70:48:9E:90:44:14:41:A0:92:6E:B8:1D:ED:EA:77:1F:81
+                keyid:B5:C3:65:5F:95:6A:F7:19:30:E3:80:DD:EF:B0:A4:1B:3D:BE:A6:9D
 
             Authority Information Access: 
                 CA Issuers - URI:http://url-for-aia/Root.cer
 
             X509v3 CRL Distribution Points: 
 
                 Full Name:
                   URI:http://url-for-crl/Root.crl
 
             X509v3 Key Usage: critical
                 Certificate Sign, CRL Sign
             X509v3 Basic Constraints: critical
                 CA:TRUE
     Signature Algorithm: sha256WithRSAEncryption
-         02:a0:b5:94:14:2a:94:44:1f:25:f2:18:9e:64:8a:f6:b3:62:
-         35:95:ca:c5:ab:21:e7:18:d3:b2:41:5a:83:ac:3a:9c:bc:21:
-         3d:4f:6e:4a:94:31:da:71:16:dc:4a:e6:bc:15:84:6c:5e:10:
-         b9:6e:62:f4:ba:b8:9a:c5:f5:53:f9:29:16:83:ab:fd:8a:81:
-         7b:39:3e:c9:2f:83:c3:37:f7:e3:0a:4d:47:bc:fc:ff:52:32:
-         70:c7:50:21:15:b6:17:79:ed:18:1e:9a:9c:a8:f9:d2:9e:76:
-         06:e3:3d:cd:2f:55:6d:e2:e5:ea:20:f7:03:80:7f:c2:13:3d:
-         99:4f:38:d0:b8:43:6e:12:69:82:79:79:0c:16:cb:6d:cb:2f:
-         b7:2a:db:07:70:2a:20:96:45:80:03:9f:45:0d:91:be:29:e0:
-         af:4a:fd:d8:68:ef:86:b1:85:cc:7d:9a:24:d0:72:a4:33:0f:
-         2e:7f:ce:e2:d4:10:8e:8b:3a:f8:d3:a0:13:ae:ca:3b:ef:2b:
-         39:d1:ba:dd:35:98:6a:44:d3:0f:f8:b7:47:f4:08:3c:f1:41:
-         45:f9:67:01:70:0c:fc:51:7b:a2:49:39:1f:31:09:e3:8c:7d:
-         98:c7:19:ce:a1:ce:a6:40:3f:ca:29:56:f4:90:2a:42:25:84:
-         2f:f1:79:fa
+         4c:7b:dd:61:fc:1e:ea:5a:d7:73:ae:8a:3b:14:19:3a:8c:ae:
+         a5:a5:37:1a:74:87:a9:de:9f:79:db:5d:ad:92:85:46:65:35:
+         a8:77:8c:c2:4e:b8:90:67:7f:ec:ed:7b:a9:b9:1d:6a:27:05:
+         22:19:92:6c:46:02:4f:3a:9c:69:67:29:12:33:e2:d6:db:c1:
+         0c:79:cb:10:77:ab:d9:df:77:1b:9c:d2:73:8e:e6:31:72:f4:
+         04:24:cb:67:b3:73:cc:02:83:7f:be:fb:01:0f:71:25:c0:02:
+         b1:23:aa:77:03:74:28:fd:5e:9b:03:af:44:60:e5:f4:be:c1:
+         c4:64:6a:17:47:ab:fe:b3:f5:47:dc:b8:f8:1c:c2:cf:bb:57:
+         ca:65:0f:73:f0:32:4d:d7:b5:38:35:f7:01:8c:13:de:ab:de:
+         cd:01:a9:5c:57:d7:2c:23:10:70:34:ea:b5:4a:eb:11:6d:ae:
+         36:ee:70:3a:d2:96:73:2d:3c:e6:fe:6f:56:ff:ea:57:39:4f:
+         ca:70:1b:0e:7e:1c:75:b0:02:0d:4e:92:bb:c0:e6:0e:7d:16:
+         c4:07:b9:12:00:a5:a5:2f:fa:0e:38:52:62:7b:55:8e:f3:4d:
+         62:c5:c1:71:ff:ab:f2:57:54:21:7d:64:7d:07:dd:d8:d9:26:
+         c2:07:39:8f
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----