Regenerate certificates used by tests. (#352)

Current certificates don't pass verification on Mac OS X Catalina
making it impossible to run test suite on Mac laptops.

test/data/README.md

@@ -0,0 +1,25 @@
+This folder contains self-signed certificates used for testing.
+
+These files are generated using the following commands:
+
+```
+$ faketime '2019-01-01' openssl req -newkey rsa:2048                      \
+                                    -nodes                                \
+                                    -keyout localhost.key                 \
+                                    -x509                                 \
+                                    -days 36500                           \
+                                    -out localhost.crt                    \
+                                    -addext extendedKeyUsage=serverAuth   \
+                                    -addext subjectAltName=DNS:localhost
+# CN=localhost, the rest of the fields are left empty (.)
+$ openssl pkcs12 -export -out certstore.p12 -inkey localhost.key -in localhost.crt
+# Password: correct
+```
+
+Note that the choice of starting date for certificate as well as the choice
+of extensions (EKU and SAN) are crucial for satisfying
+[Mac OS X requirements](https://support.apple.com/en-us/HT210176) for TLS
+certificates.
+
+If these are not satisfied tests will hang and spew cryptic "Connection
+terminated during handshake" errors.

test/data/localhost.crt

@@ -1,19 +1,20 @@
 -----BEGIN CERTIFICATE-----
-MIIDCzCCAfOgAwIBAgIUX+JAHB5rP579AFtA6aeUyvxo18EwDQYJKoZIhvcNAQEL
-BQAwFDESMBAGA1UEAwwJbG9jYWxob3N0MCAXDTE5MDkyNDA3MzczMFoYDzIxMTkw
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+yTSUIeMSOo0QjA==
 -----END CERTIFICATE-----

test/data/localhost.key

@@ -1,28 +1,28 @@
 -----BEGIN PRIVATE KEY-----
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 -----END PRIVATE KEY-----