Comment 1 for bug 1544796

Reviewing the changes between the last blessed master and fail I see:
    https://github.com/juju/juju/commit/b4e2785874df8c612c46c55b70903554b16bd156
    https://github.com/juju/juju/commit/c2150283643eef3cd37e50ae48df8f5049428dcb
But both of these were merged into the maas-spaces branch and tested, and blessed.

So given maas-spaces has bless commits, the only commit that is in failing master revision, but not maas-spaces is
     https://github.com/juju/juju/commit/f1ca8c74e57fe08f82adf883b66ddde226299857