[logdog_butler] Partially resurrect -streamserver-uri.
[logdog_butler] Partially resurrect -streamserver-uri.

It is still used on Linux.

R=40f3d43a28ebae3cb819288542e1c84d73d962d5@chromium.org
BUG=1208132

Change-Id: I6db1d3a6a09dfd8a11a5f448535a9c564595ed29
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/2894689
Reviewed-by: Robbie Iannucci <40f3d43a28ebae3cb819288542e1c84d73d962d5@chromium.org>
Commit-Queue: Vadim Shtayura <9f116ddb1b24f6fc1916a676eb17161b6c07dfc1@chromium.org>

luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go,luci/luci-go