Don't fail when /etc/monasca/api-config.yml is not found
Don't fail when /etc/monasca/api-config.yml is not found

Default to a port number if the api config is not found or cannot be parsed

Change-Id: Ie1c0cb1962370c76ec44627cdb7020f2d716fd0d

sapcc/monasca-agent,sapcc/monasca-agent,sapcc/monasca-agent