Adds SSL/TLS support

Adds SSL/TLS support

Allows configuration for requiring TLS communication across Northbound
REST and OVSDB/OF with OVS.  The TLS configuration enables two
keystores, "controller" and "truststore".  The controller keystore is
used to hold the private key and certificate, which may be
auto-generated or provided as input parameters.  The truststore holds
trusted certificates for clients connecting to ODL and may also be
provided via a parameter.  Additionally when providing the private key
and certificate to the controller keystore, a public certificate
authority certificate may be linked.

Change-Id: I079fc0759bb42888472ef95ca239c3ca67db8a56
Signed-off-by: Tim Rozet <trozet@redhat.com>
Signed-off-by: Daniel Farrell <dfarrell@redhat.com>