Explicitly stating utf-8 when fetching oauth token
Explicitly stating utf-8 when fetching oauth token

Fixes #2870

Signed-off-by: Eric Lin <12bbeab04c96e4430d35de12338ac17f02144a76@gmail.com>

miaoyq/containerd,vdemeester/containerd,dmcgowan/containerd,thaJeztah/containerd,estesp/containerd,mikebrow/containerd,crosbymichael/containerd,dmcgowan/containerd,thaJeztah/containerd,estesp/containerd,crosbymichael/containerd,vdemeester/containerd,miaoyq/containerd,mikebrow/containerd,containerd/containerd,containerd/containerd