configure credhub database with RDS

[ronakbanka]

Thanks for submitting an pull request to pcf-pipelines.

To speed up the process of reviewing your pull request please provide us with:

• A short explanation of the proposed change:

Current PCF pipelines for AWS configure PAS credhub db as internal mysql which leads to failed backup process as no internal mysql is running on AWS PAS deployment.

• An explanation of the use cases your change solves:

This PR created a credhub database on RDS, and configures PAS credhub db with credentials & CA cert, which can be configured from params.yml.

• Expected result after the change:

Credhub database configuration with RDS & AWS PCF deployment can be backed up using BBR without any mysql errors.

• Current result before the change:

BBR tasks fails looking for cf.internal service on PAS deployment.

• Links to any other associated PRs or issues:

• [x] I have viewed signed and have submitted the Contributor License Agreement

• [x] I have made this pull request to the master branch

• [x] I have run all the unit tests

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[poligraph]

It is very useful PR, can`t wait when it merged.