Error message filtering for 403 response from docker IMDS endpoint should be relaxed

[christothes]

There seems to be some variation between the error messages being returned by the 403 response from IMDS in docker. Our error handling should be adjusted to match the error message more loosely.

We've seen it as either of these two:
"A socket operation was attempted to an unreachable network"
"A socket operation was attempted to an unreachable host"

see original issue here: Azure/azure-sdk-for-net#38218 (comment)