fix rejoin error and add githash to callstat configParams.
fix rejoin error and add githash to callstat configParams.

bpyoung92/apprtc,bpyoung92/apprtc,bpyoung92/apprtc,webrtc/apprtc,webrtc/apprtc,bpyoung92/apprtc,bpyoung92/apprtc,webrtc/apprtc,webrtc/apprtc,webrtc/apprtc