[PATCH 2 of 2 V3 remotenames-ext] remotenames: selectivepull, update to the unknown bookmark tries to pull it

[Sean Farley]

Stanislau Hlebik <stash at fb.com> writes:

> # HG changeset patch
> # User Stanislau Hlebik <stash at fb.com>
> # Date 1471860690 25200
> #      Mon Aug 22 03:11:30 2016 -0700
> # Node ID 7dae93347fd658a558284e55d27060e980f324f0
> # Parent  866049ffa049dc598af834a035f27a06684d264d
> remotenames: selectivepull, update to the unknown bookmark tries to pull it
>
> Part of Selective Pull project (see https://www.mercurial-scm.org/wiki/SelectivePullPlan for details).
> If Selective Pull is enabled, then we want to be able to check out
> revision even if it's not present locally, but present on remote server.
> If rev or node is not present locally, new request is issued to find
> it remotely. If it is present remotely then it's pulled.

After sitting down together at the sprint, I was able to review these
and fix up the tests. Finally queued and pushed, thanks!