use https for node url

[fleandrei]

As described in this issue #41 https doesn't work on station.massa:33035. This create errors when using the node inside station and exploring website served in https as calling a http content from a https site is a mixed content security issue.

In issue #41 we have implemented a quick fix: instead of using http://station.massa:33035, we use http://localhost:33035 which doesn't rise mixed content error.
But it would be good to be able to use https on nodes deployed via node manager plugin and use station.massa:33035 url for that.
We need to investigate why the certificate doesn't work. It may be related to commit 57ee468 in station that aimed at fixing ssl certificate renewal.