Allow to fetch and apply certificates with root user read only access

[vivekshankar1]

🔩 Description: What code changed, and why?

Allow to fetch and apply certificates with root user read only access

If the user is trying to fetch a certificate from a root or local location with only read permission for the root, the certificate rotate command will fail to fetch the certificate

chef-automate cert-rotate --public-cert <public_cert> --private-cert <private_cert> --root-ca <root_ca>

In order to be able to get contents even if its readonly we will prefer executing commands over ssh to get the contents rather than doing scp

⛓️ Related Resources

https://chefio.atlassian.net/browse/SHIELD-224

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