Reauthenticate to get new token on rxing 401. Don't reauthenticate if token is specified while invoking VncApi

Change-Id: I8e876d48e1da5410a4c52e7fd944584a886100ac
Merge "Reauthenticate to get new token on rxing 401. Don't reauthenticate if token is specified while invoking VncApi"
rebased and resubmitted