Fix feature-ifdef for OpenSSL builtin certname checking
Testsuite: use different exit codes for various fail modes of "client" utility
Testsuite: increase default "client" utility connect timeout from 1 to 5 seconds
Testcase 0601: move udpsend action from connect to rcpt ACL

Some test runs were seeing the receiving perl output before the exim startup banner;
try to get the udpsend to happpen after the banner gets a chance to be emitted.