[3.2.0] Avoid Packaging MySQL JDBC Driver in WSO2 Product Docker Images

[chirangaalwis]

Description:
It has been suggested to avoid packaging the MySQL JDBC Driver in the WSO2 product Docker images.

The original purpose of packaging this binary in Docker images was to support evaluatory deployments in container platforms such as, Kubernetes with externalized MySQL RDBMS support.

For a user who intends to use a different version of the particular connector (as opposed to what is packaged inside the image) may not be able to use the current, official WSO2 product Docker images as the base since, he/she may experience version conflicts.

Affected Product Version:
Docker resources for WSO2 API Management version v3.1.0.3 and below

[chirangaalwis]

As per the initial evaluation, we can continue to install this connector for evaluation purposes in each container platform, via the following methods.

• Docker Compose
  Please see the official documentation for the suggested method.

• Kubernetes
  Use Kubernetes InitContainers and shared volume mounts.

[chirangaalwis]

Fixed in #335.