ssl_callback_SSLVerify() was calling (the expensive) X509_NAME_oneline()

function and free() of the return value twice each, for logging
regardless of SSLLogLevel.  changed to happen only if SSLLogLevel >= trace
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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk/modules/ssl@92236 13f79535-47bb-0310-9956-ffa450edef68