Bump github.com/docker/docker #911

Job	Run time
Build and test	1m 29s
Build and test	1m 29s
Build and test	1m 29s
Build and test	1m 29s
Build and test	1m 29s
Check generated code is up to date	8s
Check generated code is up to date	8s
Check generated code is up to date	8s
Check generated code is up to date	8s
Check generated code is up to date	8s
Nilaway	22s
Nilaway	27s
Nilaway	44s
Nilaway	33s
Nilaway	28s
License check	16s
License check	16s
License check	16s
License check	16s
License check	16s
	11m 59s

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