CLI: genesis push

[akremenetsky]

The push section can be specified into genesis/genesis.yaml config. It's not convenient sometimes, since the config need keep repository references but after distribution it doesn't make sense.

push:
    local:
        driver: fs
        path: /var/lib/genesis/http
     city:
        driver: nginx
        url: http://repo.local.genesis-core.tech:8080/

Add ability to push only from command like. For example,

genesis push --driver nginx --url http://repo.local.genesis-core.tech:8080/