Upgrade AdoptOpenJDK version to the latest version - jdk8u212-b03

[chirangaalwis]

Description: The AdoptOpenJDK version needs to be updated to the latest version (at 10/05/2019) - jdk8u212-b03.

Sub Tasks:

• [x] Upgrade version in Alpine based Docker resources
• [x] Upgrade version in CentOS based Docker resources
• [x] Upgrade version in Ubuntu based Docker resources
• [x] Code/Peer review

[chirangaalwis]

Fixed in https://github.com/wso2/docker-sp/pull/89.