configure https using application configuration and support SSL client a...

In this commit I wanted to :
- configure HTTPS with the application configuration (only System properties were used)
- configure the TLS mutual authentication
- configure the server trustore

As a result, if you set https.clientCertificate to : 
- "needs" : the client certificate will be required
- "wants" : the client certificate will be accepted
- other : only server authentication is activated.
(exactly like Apache Felix HTTP Service works)