of14: Add bundle add message support

---
v4
* Inherit MsgInMsgBase instead of MsgBase
  - This is a new mechanism to allow messages inside messages

v2 - v3
* No change
of14: Add bundle add message unit test

Signed-off-by: Simon Horman <horms@verge.net.au>

---
v4
* No change

v3
* Update Data to use bytes rather than arrays of words
* Correct sequence number in filenames: 5-69* => 5-70*

v2
* Update JSON using normalize_json.py
Add request forward message support

Signed-off-by: Simon Horman <horms@verge.net.au>

---
v4
* Inherit MsgInMsgBase instead of MsgBase
  - This is a new mechanism to allow messages inside messages

v3
* No change

v2
* First post
Add request forward message unit test

Signed-off-by: Simon Horman <horms@verge.net.au>

---
v4
* No change

v3
* Fix sequence number in filenames: Rename 5-70* => 5-71

v2
* First post