--config-set for multiple configurations
In perspective of #9 (closed) :
instead of using a single config file in ~/.icinga/
allow the user to create multiple files for any icing api.
This would allow the addition of a new --config-set <config>
flag to load the specific configuration just for one command
Example
$ ls ~/.icinga
aws.yaml gce.yaml home.yaml work.yaml
# use home.yaml config-set
$ icinga-cli --config-set home