Identity Data Source Pool Options Not Generated Properly

[chirangaalwis]

Describe the issue:
According to IS config generation values (repository/resources/conf/default.json), it only populates shared data source's pool parameters by default, but not the Identity data source parameters.

  "database.shared_db.id": "SHARED_DB",
  "database.shared_db.pool_options.maxActive": "50",
  "database.shared_db.pool_options.maxWait": "60000",
  "database.shared_db.pool_options.testOnBorrow": "true",
  "database.shared_db.pool_options.validationInterval": "30000",
  "database.shared_db.pool_options.defaultAutoCommit": "true",
  "database.shared_db.jmx_enable": "false"

As a result, the datasource will be configured only with the validation query ('SELECT 1').

Original issue:
wso2/kubernetes-is#219

Suggested labels:
Type/Bug