Extend SSLOCSPEnable with mode 'leaf' that only checks the leaf of a...

Extend SSLOCSPEnable with mode 'leaf' that only checks the leaf of a certificate chain. PR62112 [Ricardo Martin Camarero <rickyepoderi@yahoo.es>] 


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1826995 13f79535-47bb-0310-9956-ffa450edef68