Description

This PR address the issue #170 to fix mbedtls C_GetAttributeValue implementation

• ulValueLen is set to CK_UNAVAILABLE_INFORMATION if the attributes for the object can't be obtained.
• Attributes in the templates will be processed when error codes are CKR_ATTRIBUTE_SENSITIVE, CKR_ATTRIBUTE_TYPE_INVALID, or CKR_BUFFER_TOO_SMALL.

Reference PKCS11-base-v2.40

Test Steps

Verify in the unit test.

Checklist:

• I have tested my changes. No regression in existing tests.
• I have modified and/or added unit-tests to cover the code changes in this Pull Request.

Related Issue

#170
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