Keyserver and Keyclients use the same locations for cluster configuration

[AngelAlvie]

Both the keyserver and keyclients use the same /etc/homeworld/config directory for extracting the configuration of the cluster. I noticed this a potential problem when I tried to delete the keyclient configs from all the nodes in the cluster in Spire as part of #441, but as a result I deleted the keyserver's config on the supervisor as well.

This leads to spire having special cases for the supervisor node, especially when it comes to setting up the key-system, see platform/spire/src/setup.py.

A potential fix would be to separate the configurations of the keyserver and the keyclients, perhaps as subdirectories of /etc/homeworld/config.

This may make it easier to maintain Spire in the future.