Merge pull request moby#31852 from mlaventure/update-containerd-17.03

[17.03.1] Update containerd to version 4ab9917febca54791c5f071a9d1f404867857fcc

bump to version 17.03.0-ce

Signed-off-by: Victor Vieux <[email protected]>

fix CHANGELOG date

Signed-off-by: Victor Vieux <[email protected]>

bump version to 1.13.1

Signed-off-by: Victor Vieux <[email protected]>

bump version to 1.13.1-rc2

Signed-off-by: Victor Vieux <[email protected]>

bump version to 1.13.0-rc7

Signed-off-by: Victor Vieux <[email protected]>

Merge pull request moby#71 from mlaventure/bump-1.12.6

Bump version to 1.12.6