Hammer CLI

Hammer still contains legacy code that handles:

• Loading config files from ~/.foreman and /etc/foreman (only ~/.hammer and /etc/hammer are supported now)
  https://github.com/theforeman/hammer-cli/blob/master/bin/hammer#L55-L63

• Loading cli modules config files from $CONF_DIR/hammer.modules.d/ (only $CONF_DIR/cli.modules.d/ is supported now)
  https://github.com/theforeman/hammer-cli/blob/master/lib/hammer_cli/settings.rb#L26-L29

• Enabling plugins via list of their names in :modules: in the settings (each plugin now defines its own section in the config and uses :enable_module: true/false)
  https://github.com/theforeman/hammer-cli/blob/master/lib/hammer_cli/modules.rb#L10-L24

The deprecation warnings have been there for quite some time. It's safe to remove the legacy code now.