hothd master: SRCREV bump 299f56e975..ab78878303

Lovepreet Singh (1):
      Handle exceptions from `sendCommand` in `ec_util.cpp`

Steven Portley (1):
      Refactor transport wrappers to support libhoth_error

Fusion-Link:
platform11+ext: https://fusion2.corp.google.com/f6412f9e-6209-3d14-ac66-cbaffb3c1e7c
platform11: https://fusion2.corp.google.com/635a8b69-f9d6-3532-8f30-c6c80942b9d9
platform5: https://fusion2.corp.google.com/b27a9a7b-48cb-3285-9ab7-6dccec6b01c3
platform15: https://fusion2.corp.google.com/c5bff8d7-140e-3463-aca8-5670e89a2a5d
platform17: https://fusion2.corp.google.com/6d8e97ef-15cb-3a38-8a0b-c6b9901f898d
Tested: N/A
Google-Bug-Id: 552303543
Change-Id: I1ac2299b432aee8f600a291ef98f2a473de954ef
Signed-off-by: Nick Hsieh <hnick@google.com>