Conjur credential manager provide certificate as string

[AndrewCopeland]

Signed-off-by: AndrewCopeland [email protected]

What does this PR accomplish?

Bug Fix

Adds the ability to provide CA certificate as a string for the conjur credential manager.

closes #5701 .

Changes proposed by this PR:

Add ability to provide the ca certificate as a string. Currently certificate must be provided as a file.

Notes to reviewer:

Relates to this Issue: concourse/concourse-bosh-release#105

Contributor Checklist

• Followed Code of conduct, Contributing Guide & avoided Anti-patterns
• Signed all commits
• Added tests (Unit and/or Integration)
• [] Updated Documentation
• [] Updated Release notes

Reviewer Checklist

• Code reviewed
• Tests reviewed
• Documentation reviewed
• Release notes reviewed
• PR acceptance performed
• New config flags added? Ensure that they are added to the
  BOSH and
  Helm packaging; otherwise, ignored for
  the integration
  tests
  (for example, if they are Garden configs that are not displayed in the
  --help text).

[vito]

Replied here: concourse/concourse-bosh-release#106 (comment) - I think this change won't be necessary if we use env_file: in the BOSH release. 🙂 Thanks!