COOPR 542: Add ability to configure UI to use TLS

SSL/TLS implemented for coopr-ui.
1. If some properties are not set something would not work and there would logs or unexpected behaviour.
2. COOPR_UI_KEY_FILE and COOPR_UI_CERT_FILE are used to crypt http server on node, while tls params are used to make tls connection working between nodejs and coopr server.