Implement a simplified version of TestGrid

[janethavi]

Description:
A simplified version of TestGrid is required for a purpose-built solution that can be used to test WSO2 products on various infrastructure combinations. The Proposed solution architecture is shown underneath.

Available Tasks
For product APIM

• APIM product deployment should be done by using the TestGrid Jenkins Pipeline.
• APIM product parallel deployment should be done based on infrastructure combination by using the TestGrid Jenkins Pipeline.
• APIM tests should be executed on the deployments.
• Test results should be extracted to a S3 bucket for reviewing.