Let wedge_agent read "fruid.json" from disk
Let wedge_agent read "fruid.json" from disk

Summary:
This diff lets wedge_agent read "fruid.json" from disk.

Depends on D3933892

Differential Revision: D3937748

fbshipit-source-id: 69dc9fca78c5d51a5fbb1b59c22e181ac7efe188

peterlei/fboss,peterlei/fboss,peterlei/fboss,peterlei/fboss