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

Merge pull request docker#1665 from docker/2.4.0-release

2.4.0 release

Merge pull request docker#1614 from docker/2.3.0-release

2.3.0 release

Merge pull request docker#1536 from docker/2.2.1-release

2.2.1 release

Merge pull request docker#1519 from shin-/2.2.0-release

2.2.0 release