Merge pull request docker#1921 from docker/3.1.0-release

3.1.0 release

Merge pull request docker#1902 from docker/3.0.1-release

3.0.1 release

Merge pull request docker#1891 from docker/3.0.0-release

3.0.0 release

Merge pull request docker#1838 from docker/2.7.0-release

2.7.0 release

Merge pull request docker#1802 from docker/2.6.1-release

2.6.1 release

Update test engine versions in Jenkinsfile

Signed-off-by: Joffrey F <[email protected]>

Conflicts:
	Jenkinsfile

Bump 2.5.1

Signed-off-by: Joffrey F <[email protected]>

Bump 2.5.0

Signed-off-by: Joffrey F <[email protected]>

Merge pull request docker#1672 from docker/2.4.2-release

2.4.2 release

Merge pull request docker#1670 from docker/2.4.1-release

2.4.1 release