[C++ API +] Add proxy mode on SignatureValidator

[C++ API +] Add proxy mode on SignatureValidator

* Purpose : Improve signature validation performance.
* Key-idea : Reference validation should be done only once
             on multiple-signatures during signature validation.

[Added C++ API]
- SignatureValidator::checkAll(bool checkOcsp,
                               bool checkReferences,
                               SignatureDataList &sigDataSet)
- SignatureValidator::checkListAll(bool checkOcsp,
                                   const UriList &uriList,
                                   SignatureDataList &sigDataSet)

Change-Id: I6abba2100fecd5fe779f0e7cdd977b6281f74d9c
Signed-off-by: sangwan.kwon <sangwan.kwon@samsung.com>