Fix race condition in TLSProxy
Normally TLSProxy waits for the s_server process to finish before continuing. However in cases where serverconnects > 1 we need to keep the s_server process around for a later test so we continue immediately. This means that TAP test output can end up being printed to stdout at the same time as s_server is printing stuff. This confuses the test runner and can cause spurious test failures. This commit introduces a small delay in cases where serverconnects > 1 in order to give s_server enough time to finish what it was doing before we continue to the next test. Fixes #4129 Reviewed-by: Rich Salz <rsalz@openssl.org> (Merged from https://github.com/openssl/openssl/pull/4660)
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