add CF client configuration for opensearch job on data nodes

[markdboyd]

Changes proposed in this pull request:

Related to cloud-gov/opensearch-boshrelease#150
Related to cloud-gov/opensearch-boshrelease#155

• Add CF client configuration for opensearch job on data nodes so it can prepare tenant, role, and role mapping configuration for CF orgs

Things to check

• For any logging statements, is there any chance that they could be logging sensitive data?
• Are log statements using a logging library with a logging level set? Setting a logging level means that log statements "below" that level will not be written to the output. For example, if the logging level is set to INFO and debugging statements are written with log.debug or similar, then they won't be written to the otput, which can prevent unintentional leaks of sensitive data.

Security considerations

None. We are not adding new roles or permissions, just ensuring that tenants and roles for CF orgs are not destroyed on restart of opensearch nodes

[JasonTheMain]

Looks good to me