Summary
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Enhance SunPKCS11 provider to support key generation for various Hmac mechanisms when supported by underlying native PKCS11 library.


Problem
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SunPKCS11 provider does not support key generation for Hmac mechanisms, thus callers have to create keys using other providers such as SunJCE, or 3rd party utility/tools.


Solution
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Enhance SunPKCS11 provider to to support the following crypto services: 

 - KeyGenerator: HmacMD5,  HmacSHA1,  HmacSHA224,  HmacSHA256 HmacSHA384 HmacSHA512,
   HmacSHA512/224, HmacSHA512/256.

Specification
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