Add support for cn-north-1

[xiaochuan-du]

As you may know, codedeploy has been lauched in China, thus it would be great if we can use this plugin soon. Thanks.

[ambareesha]

We are working on fixing this. Thank you for your patience.

[gdeblina]

Jenkins plugin is now available in China

[xiaochuan-du]

Thanks.

[cncoder]

Hi Team,

The China (Ningxia) Region, operated by NWCD, supports AWS Codedeploy last year. Could you support this region now?

Please see this PR for more detail. #101

[Levi-Lo]

Could you support cn-northwest-1 region ?