Enhanced CRL checking and automatic CRL retrieval for libEST/examples#41

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DDvO wants to merge 1 commit intocisco:mainfrom

DDvO:crl_retrieval_and_strict_checking_manual_cert_verify_cb_for_server

Commits on May 21, 2016

improved cert verify callbacks: added CRL strictness and CRL retrieval; new stengthened callback also for server side
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