this commit remove the code which sets the dmcrypt encryption
key from secret as environment variable in the prepare pod job
spec. Now, the env will be set under function `setKEKinEnv`, which
tries to reads secret from k8s first method `c.IsK8s()`under
`GetSecret` and then check for KMS to ready and apply env directly.
Signed-off-by: subhamkrai <srai@redhat.com>