REGTESTS: ssl: Add tests for the connection and SSL error fetches

This reg-test checks that the connection and SSL sample fetches related
to errors are functioning properly. It also tests the proper behaviour
of the default HTTPS log format and of the log-legacy-conn-error option
which enables or disables the output of a special error message in case
of connection failure (otherwise a line following the configured
log-format is output).
1 file changed