Vadim, please confirm and assign to me for execution.

I don't know, I'm on the fence. On one hand I can see raw Swarming tasks being useful, on the other hand, no one is actually using them or plans to use them :-/

Considering Swarming task implementation in Scheduler is very similar to Buildbucket task implementation, I think we'll be able to "restore" it later, if needed, using Buildbucket task implementation as a template.

So yeah, let's kill it for now.

let's bump priority cause deleting code is fun

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/luci/luci-go.git/+/5377278f0bbf327950f2238393182e44649deee1

commit 5377278f0bbf327950f2238393182e44649deee1
Author: Andrii Shyshkalov <tandrii@chromium.org>
Date: Mon Oct 30 21:47:59 2017

scheduler: log warnings if raw swarming jobs are defined.

End goal is to remove raw swarming job support from scheduler.

R=vadimsh@chromium.org

Bug:  767287 
Change-Id: I4ab3535589ac140cfa8111780b241d4c917c14b3
Reviewed-on: https://chromium-review.googlesource.com/742696
Reviewed-by: Vadim Shtayura <vadimsh@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>

[modify] https://crrev.com/5377278f0bbf327950f2238393182e44649deee1/scheduler/appengine/catalog/catalog.go

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/experimental/+/788a7c3fa47407b4787cd01fba14d9d548938fc0

commit 788a7c3fa47407b4787cd01fba14d9d548938fc0
Author: Andrii Shyshkalov <tandrii@chromium.org>
Date: Mon Oct 30 21:53:27 2017

Delete swarming-sleepy-job, raw swarming tasks won't be supported.

TBR=vadimsh@chromium.org

Bug:  767287 
Change-Id: Ibf3429d979d69f77ce2954b55edd8429b238e21e
Reviewed-on: https://chromium-review.googlesource.com/744969
Reviewed-by: Andrii Shyshkalov <tandrii@chromium.org>

[modify] https://crrev.com/788a7c3fa47407b4787cd01fba14d9d548938fc0/luci-scheduler-dev.cfg

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/luci/luci-go.git/+/c772afdef3c5cb053edad57a33b476a1c375a839

commit c772afdef3c5cb053edad57a33b476a1c375a839
Author: Andrii Shyshkalov <tandrii@chromium.org>
Date: Mon Oct 30 22:01:58 2017

scheduler: fail validation for raw swarming jobs.

End goal is to remove raw swarming job support from scheduler.

R=vadimsh@chromium.org

Bug:  767287 
Change-Id: Ie091f5dab849a7498b9b96c64b685f2030459ceb
Reviewed-on: https://chromium-review.googlesource.com/742697
Reviewed-by: Vadim Shtayura <vadimsh@chromium.org>
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>

[modify] https://crrev.com/c772afdef3c5cb053edad57a33b476a1c375a839/scheduler/appengine/catalog/catalog.go
[modify] https://crrev.com/c772afdef3c5cb053edad57a33b476a1c375a839/scheduler/appengine/messages/cron.pb.go
[modify] https://crrev.com/c772afdef3c5cb053edad57a33b476a1c375a839/scheduler/appengine/messages/cron.proto

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/luci/luci-go.git/+/9136a96452f22e02955689b12f838cfbe557183a

commit 9136a96452f22e02955689b12f838cfbe557183a
Author: Andrii Shyshkalov <tandrii@chromium.org>
Date: Mon Oct 30 22:16:36 2017

scheduler: remove raw swarming job support.

R=vadimsh@chromium.org

Bug:  767287 
Change-Id: Idf3c237e46d9e4052a3a9afbb2cc09c8f4a5f517
Reviewed-on: https://chromium-review.googlesource.com/742365
Commit-Queue: Andrii Shyshkalov <tandrii@chromium.org>
Reviewed-by: Vadim Shtayura <vadimsh@chromium.org>

[modify] https://crrev.com/9136a96452f22e02955689b12f838cfbe557183a/scheduler/appengine/catalog/catalog.go
[modify] https://crrev.com/9136a96452f22e02955689b12f838cfbe557183a/scheduler/appengine/catalog/catalog_test.go
[modify] https://crrev.com/9136a96452f22e02955689b12f838cfbe557183a/scheduler/appengine/frontend/handler.go
[modify] https://crrev.com/9136a96452f22e02955689b12f838cfbe557183a/scheduler/appengine/messages/cron.pb.go
[modify] https://crrev.com/9136a96452f22e02955689b12f838cfbe557183a/scheduler/appengine/messages/cron.proto
[delete] https://crrev.com/c772afdef3c5cb053edad57a33b476a1c375a839/scheduler/appengine/task/swarming/swarming.go
[delete] https://crrev.com/c772afdef3c5cb053edad57a33b476a1c375a839/scheduler/appengine/task/swarming/swarming_test.go

Deployed to prod and dev as version 2240-9136a96