tests/pki: Use CA/certificate valid until 2048 and with 2048 bits

This changes tests/pki/server-cert.pem and tests/pki/ca-cert.pem to have
2048 bits. These certificates were generated using the
instructions on https://www.spice-space.org/spice-user-manual.html
The -subj args were omitted, and the defaults suggested by openssl used.
The -days parameter was changed to -days 10950, the bits to 2048.

This fixes https://gitlab.freedesktop.org/spice/spice/issues/27.

Some distros are starting to use stricter settings for their openssl
configuration, which forbids 1024 bit keys, and causes test suite
failures.

Signed-off-by: Frediano Ziglio <fziglio@redhat.com>
Acked-by: Christophe Fergeau <cfergeau@redhat.com>

server/tests/pki/ca-cert.pem

@@ -1,15 +1,20 @@
 -----BEGIN CERTIFICATE-----
-MIICUjCCAbugAwIBAgIJAKM/WOQQB3iqMA0GCSqGSIb3DQEBCwUAMEIxCzAJBgNV
+MIIDWjCCAkKgAwIBAgIJAILhGzNuNWQHMA0GCSqGSIb3DQEBCwUAMEIxCzAJBgNV
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 -----END CERTIFICATE-----

server/tests/pki/server-cert.pem

@@ -1,13 +1,18 @@
 -----BEGIN CERTIFICATE-----
-MIIB8zCCAVwCAQEwDQYJKoZIhvcNAQELBQAwQjELMAkGA1UEBhMCWFgxFTATBgNV
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-st+gUqdKc2jvb301TbS+SlDaK1Nre5vB8bPg1cJxUwWX1fDy2igIok0KmM1P7S8M
-isa/qmobRb4rzvn3blThesqFez9xRhk=
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 -----END CERTIFICATE-----

server/tests/pki/server-key.pem

@@ -1,15 +1,27 @@
 -----BEGIN RSA PRIVATE KEY-----
-MIICXAIBAAKBgQDFwzzGS7HvArhMCSjJLxHZgcCvt909IzjJFCT7fC7Hiwo15mDo
-q9oFq7Jz+X4MacMf18W+tYr8IQLQtphXMt8V6UTZAx5Nxdl6RsA9DLI/bUfQ2Inc
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 -----END RSA PRIVATE KEY-----