Fixed HMI processes RPC as unsuccessful in case of custom UNSUPPORTED_RESOURCE result code

[Ypostolov]

Fixes #577

This PR is ready for review.

Testing Plan

• SDL and HMI are started;
• Mobile app is registered and activated:
• Go to Main HMI setting-> RPC Control ->registered app name;
• Set UNSUPPORTED_RESOURCE result code for some RCP(e.g. AddSubMenu, AddCommand);
• Mobile app requests RPC (AddSubMenu, AddCommand) that has custom UNSUPPORTED_RESOURCE result code on HMI;

Observe HMI adds requested item and responds with UNSUPPORTED_RESOURCE result code.

Summary

Fixed HMI processes RPC as unsuccessful in case of custom UNSUPPORTED_RESOURCE result code.

CLA

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