Enhance terraform code for AWS and OCI providers to wait till sshd is up and running on cloud instance before returning success.

[robbierafay]

Enhance terraform code to wait till sshd is up and running on cloud instance before returning success. Currently there is a static 2 minutes wait after cloud instance creation which might or might not be enough all the time. The terraform code location

1. AWS : tf/aws
2. OCI: tf/oci