Implement -wait option for 'swarming collect' command
Implement -wait option for 'swarming collect' command

'-wait=false' is equivalent to '--timeout=-1' in swarming.py collect
https://source.chromium.org/chromium/infra/infra/+/main:luci/client/swarming.py;l=1315-1321;drc=bb49b0dfbb6dd7849104f1e1f50f1fa8ee78030c

Bug: 1255535
Change-Id: I353b0e98991aae61c22645887f197a63be584877
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-go/+/3226192
Commit-Queue: Junji Watanabe <aaef61ef98ffea505db831f310be2a0eb8492537@google.com>
Commit-Queue: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Auto-Submit: Junji Watanabe <aaef61ef98ffea505db831f310be2a0eb8492537@google.com>
Reviewed-by: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>

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