[swarming] allow swarming bot to run under Chrome Remote Desktop
[swarming] allow swarming bot to run under Chrome Remote Desktop

The existing restriction prevents running a local testing flow while
logged into my desktop via CRD. The stated reason seems like it would
apply equally well to non-CRD flows though (e.g. running via tmux,
running via multiple console windows in one login session). If the local
test needs to anyway be aware of not leaving behind stale swarming bots,
then the CRD restriction doesn't seem to have much value.

BUG=None
TEST=None

Change-Id: I74a7d21400c6f296b8943e67a5d42d85566fb85a
Reviewed-on: https://chromium-review.googlesource.com/c/1331989
Reviewed-by: Marc-Antoine Ruel <d2bf0fc09b08f7b0888b3ddab32b3e89c7122c8b@chromium.org>
Commit-Queue: Marc-Antoine Ruel <d2bf0fc09b08f7b0888b3ddab32b3e89c7122c8b@chromium.org>
Auto-Submit: Aviv Keshet <178e8ae417efbe404feca7ab4cb8f0ba8c109369@chromium.org>

luci/luci-py,luci/luci-py,luci/luci-py,luci/luci-py