Fix: Rename HCL packer files example

Change-Id: Ibf65b3c2264c393934c6c8f1459e48c0970b02f6
Signed-off-by: Anil Belur <abelur@linuxfoundation.org>

diff --git a/vars/cloud-env-aws.pkrvars.hcl b/vars/cloud-env-aws.pkrvars.hcl.example
similarity index 100%
rename from vars/cloud-env-aws.pkrvars.hcl
rename to vars/cloud-env-aws.pkrvars.hcl.example

diff --git a/vars/cloud-env.pkrvars.hcl b/vars/cloud-env.pkrvars.hcl.example
similarity index 100%
rename from vars/cloud-env.pkrvars.hcl
rename to vars/cloud-env.pkrvars.hcl.example