logflags: reduce default loglevel to Error (#1864)
logflags: reduce default loglevel to Error (#1864)

Logged errors should be visible even if the corresponding flag was not
selected.
derekparker/delve,go-delve/delve,aarzilli/delve,derekparker/delve,go-delve/delve,go-delve/delve,derekparker/delve,aarzilli/delve,go-delve/delve,go-delve/delve,aarzilli/delve,aarzilli/delve