Revert of Adds bot_update to depot_tools.

Revert of Adds bot_update to depot_tools. (patchset #8 id:140001 of https://codereview.chromium.org/1641363002/ )

Reason for revert:
Exposed recipe engine bug with ambiguous names, causing roller blockage.

Original issue's description:
> Adds bot_update to depot_tools.
> 
> This CL imports the bot_update script, along with the bot_update and gclient recipe modules from build. This should allow for recipes to run on swarming.
> 
> Also moves the recipe stuff into the infra folder.
> 
> bot_update has been modified. See full diff at https://paste.googleplex.com/4969207737352192
> 
> TBR=phajdan.jr@chromium.org
> 
> BUG=
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=298490

TBR=iannucci@chromium.org,phajdan.jr@chromium.org,martiniss@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=298505

[luqui, 2016-02-01 23:57:47]

Created Revert of Adds bot_update to depot_tools.

[martiniss, 2016-02-02 00:13:59]

lgtm

[luqui, 2016-02-02 00:14:01]

The CQ bit was checked by luqui@chromium.org

[commit-bot: I haz the power, 2016-02-02 00:14:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1651323002/300001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1651323002/300001

[commit-bot: I haz the power, 2016-02-02 00:16:12]

Description was changed from

==========
Revert of Adds bot_update to depot_tools. (patchset #8 id:140001 of
https://codereview.chromium.org/1641363002/ )

Reason for revert:
Exposed recipe engine bug with ambiguous names, causing roller blockage.

Original issue's description:
> Adds bot_update to depot_tools.
> 
> This CL imports the bot_update script, along with the bot_update and gclient
recipe modules from build. This should allow for recipes to run on swarming.
> 
> Also moves the recipe stuff into the infra folder.
> 
> bot_update has been modified. See full diff at
https://paste.googleplex.com/4969207737352192
> 
> TBR=phajdan.jr@chromium.org
> 
> BUG=
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=298490

TBR=iannucci@chromium.org,phajdan.jr@chromium.org,martiniss@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=
==========

to

==========
Revert of Adds bot_update to depot_tools. (patchset #8 id:140001 of
https://codereview.chromium.org/1641363002/ )

Reason for revert:
Exposed recipe engine bug with ambiguous names, causing roller blockage.

Original issue's description:
> Adds bot_update to depot_tools.
> 
> This CL imports the bot_update script, along with the bot_update and gclient
recipe modules from build. This should allow for recipes to run on swarming.
> 
> Also moves the recipe stuff into the infra folder.
> 
> bot_update has been modified. See full diff at
https://paste.googleplex.com/4969207737352192
> 
> TBR=phajdan.jr@chromium.org
> 
> BUG=
> 
> Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=298490

TBR=iannucci@chromium.org,phajdan.jr@chromium.org,martiniss@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=

Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=298505
==========

[commit-bot: I haz the power, 2016-02-02 00:16:12]

Committed patchset #2 (id:300001) as
http://src.chromium.org/viewvc/chrome?view=rev&revision=298505