Fix HTTPS test pattern: use try-catch instead of checking start() return value

The webserver::start(false) method returns false when started successfully
in non-blocking mode (by design). The tests were incorrectly interpreting
this as a failure. Fixed by catching the exception that's thrown when
the server actually fails to start.

Also regenerated test certificates with valid dates (the old ones expired
in 2009).

Changes:
- Fix https_webserver, tls_session_getters, and all client_cert tests
- Regenerate cert.pem, key.pem, client_cert.pem, client_key.pem

Author: etr

test/cert.pem

@@ -1,17 +1,19 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----

test/client_cert.pem

@@ -1,20 +1,20 @@
 -----BEGIN CERTIFICATE-----
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 -----END CERTIFICATE-----

test/client_key.pem

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