Group option for private keys

[mvdriel]

I would like to make a private key accessible for a group, but although this option seems to be available in the configuration, it doesn't work caused by the applied permission 600 on private keys. How about read permission for the group when there is a group specified?

In the previous version it was possible to workaround this by doing something like this:

owner: www-data
home: /etc/cacti

[tersmitten]

Make mode configurable? With the current mode as default.

[mvdriel]

@tersmitten Good idea! I will implement this today or tomorrow.

[tersmitten]

Thanks

[tersmitten]

Fixed in #9