Close #44.

Configuration description taken from:

* https://firewalld.org/documentation/man-pages/firewalld.conf.html

When specifying rich rules as a dictionary ipsets and services can be
specified as lists. They will be expanded out by the jinja template into
individual rich rules for the parent zone.

Now multiple sections ending with `services` can be defined for each in pillar
and all of them will get merged into one service block in the zone. The goal is
to keep backward compatibility while allowing different services to be defined
in different pillars. So basically have various parts of the pillar affecting
the firewall without need to define everything centrally. Helpful for the
exceptions to the rules.

Firewalld does not parse the name attribute.

Log message:
firewalld[1999]: ERROR: Failed to load zone file 'public.xml':
PARSE_ERROR: icmp-block-inversion: Unexpected attribute name

update kitchen travis
fix ipsets.sls

I wanted to be able to add an ipset as a source in the zone without using a rich rule.  I believe this change accomplishes that.  Tested and working on CentOS 7 (salt master and minion).

human readable