XD-2119,XD-2143,XD-2144

* Add 'spring-boot-starter-security' as a dependency
* Set up the admininstration and management endpoints as insecure by default
* Unit tests for SSL
* Unit tests for security enablement
XD-2119,XD-2143,XD-2144

* Add 'spring-boot-starter-security' as a dependency
* Set up the admininstration and management endpoints as insecure by default
* Unit tests for SSL
* Unit tests for security enablement
XD-2145 - Shell changes:

* Use Apache HttpClient for authentication in the Shell
* admin config server' now supports the '--username' and '--password' parameters
* Supporting unit tests for HTTPS and authentication in the Shell.