If raw data fails to encrypt, don't send the protocol message

[joeljfischer]

Fixes #1830

Risk

This PR makes no API changes.

Testing Plan

• I have verified that I have not introduced new warnings in this PR (or explain why below)
• I have run the unit tests with this PR
• I have tested this PR against Core and verified behavior (if applicable, if not applicable, explain why below).

Unit Tests

No unit test updates needed

Core Tests

• Start up an encrypted video stream

Core version / branch / commit hash / module tested against: v7.1.1
HMI name / version / branch / commit hash / module tested against: generic_hmi v0.10.0

Summary

1. If a packet of video data fails to encrypt, the protocol message wrapper will not be sent.
2. If a StartService is encrypted, it's payload should be sent.

Changelog

Bug Fixes

• If a packet of video data fails to encrypt, the protocol message wrapper will not be sent. This should prevent Core from receiving malformed video data.
• If an encrypted StartService is sent, the payload should be included. This should prevent Core from rejecting video StartService above a certain RPC version level.

Tasks Remaining:

• Smoke Tests

CLA

• I have signed the CLA

[codecov]

Codecov Report

Merging #2005 (e0c6c86) into develop (e1785f7) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@             Coverage Diff             @@
##           develop    #2005      +/-   ##
===========================================
- Coverage    86.10%   86.07%   -0.04%     
===========================================
  Files          441      441              
  Lines        22625    22627       +2     
===========================================
- Hits         19482    19476       -6     
- Misses        3143     3151       +8