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Maxime Beauchemin 
[AIRFLOW-1294] Backfills can loose tasks to execute

In backfills we can loose tasks to execute due to
a task
setting its own state to NONE if concurrency
limits are reached,
this makes them fall outside of the scope the
backfill is
managing hence they will not be executed.

Dear Airflow maintainers,

Please accept this PR. I understand that it will
not be reviewed until I have checked off all the
steps below!

### JIRA
- [X] My PR addresses the following [Airflow JIRA]
(https://issues.apache.org/jira/browse/AIRFLOW/)
issues and references them in the PR title. For
example, "[AIRFLOW-XXX] My Airflow PR"
    -
https://issues.apache.org/jira/browse/AIRFLOW-1294

### Description
- [X] Here are some details about my PR, including
screenshots of any UI changes:

In backfills we can loose tasks to execute due to
a task
setting its own state to NONE if concurrency
limits are reached,
this makes them fall outside of the scope the
backfill is
managing hence they will not be executed.

### Tests
- [X] My PR adds the following unit tests __OR__
does not need testing for this extremely good
reason:
Should be covered by current tests, will adjust if
required.

### Commits
- [X] My commits all reference JIRA issues in
their subject lines, and I have squashed multiple
commits if they address the same issue. In
addition, my commits follow the guidelines from
"[How to write a good git commit
message](http://chris.beams.io/posts/git-
commit/)":
    1. Subject is separated from body by a blank line
    2. Subject is limited to 50 characters
    3. Subject does not end with a period
    4. Subject uses the imperative mood ("add", not
"adding")
    5. Body wraps at 72 characters
    6. Body explains "what" and "why", not "how"

mistercrunch aoen saguziel This is a simplified
fix that should be easier to digest in 1.8.2. It
does not address all underlying issues as in
https://github.com/apache/incubator-
airflow/pull/2356 , but those can be addressed
separately and in smaller bits.

Closes #2360 from bolkedebruin/fix_race_backfill_2

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Source Files on job 6506.6 (TOX_ENV=py34-cdh-airflow_backend_postgres)