Update behavior of SOPC_KeyManager_Certificate_GetThumbprint

Issue from discussion #612 (closed)
File: src/Common/crypto/lib_itf/sopc_key_manager_lib_itf.h

SOPC_KeyManager_Certificate_GetThumbprint expects a pre-allocated buffer, we should update it to let the function do the allocation with the length required by SOPC_CryptoProvider.

Edited by Robin Barrucand
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