blueprint and inputs for 4.3.0 policy-handler

blueprint and inputs for 4.3.0 policy-handler

- set up tls on policy-handler
- policy-handler expecting the deployment process
  to mount certs at /opt/app/policy_handler/etc/tls/certs/
  = cert_directory : /opt/app/policy_handler/etc/tls/certs/
  = cacert : cacert.pem

- new optional fields tls_ca_mode in config on consul that
  specify where to find the cacert.pem for tls per each https/web-socket
    values are:
    "cert_directory" - use the cacert.pem stored locally in cert_directory
                       this is the default if cacert.pem file is found
    "os_ca_bundle"   - use the public ca_bundle provided by linux system.
                       this is the default if cacert.pem file not found
    "do_not_verify"  - special hack to turn off the verification by cacert
                       and hostname
- config on consul now has 2 new fields for policy_engine
  = "tls_ca_mode" : "cert_directory"
  = "tls_wss_ca_mode" : "cert_directory"
- config on consul now has 1 new field for deploy_handler
  = "tls_ca_mode" : "cert_directory"

Change-Id: Ida2d058cad93ddd1a583e1922bc5dc33c145fcba
Signed-off-by: Alex Shatov <alexs@att.com>
Issue-ID: DCAEGEN2-611