Wolfhsm updates

[bigbrett]

Pulls in some of the updates from #12 (which are needed), but with the following changes:

• omits the user_settings.h modifications
• omits inclusion of wolfSSL source code on the server side.
• keeps test/bench demos, but turns them off by default, since tests don't pass

NOTE: This contains a hack in 85d2622 that zeros out the AES context to get it to work. Instead, this needs to be done in wh_Client_SetKeyIdAes() so that garbage doesn't fail the length check in wolfcrypt AES

Stopgap so we can get the changes in.

[billphipps]

Good stopgap. I'll merge now.

[bigbrett]

@billphipps awesome, thx. Buys us time until you can continue on #12 again