Fix ordering when checking insync

[markeganfuller]

is is not guaranteed to be sorted so we need to sort it before comparing to should.sort

Initially noticed on Centos 7.4 with zone interfaces:

# c7.3
$ firewall-cmd --permanent --list-interfaces --zone=trusted
eno1 enp22s0 enp2s0f0 enp4s0 enp6s0f0 enp80s0f0 ens1 ens1f0 ens2f0 ens6
# c7.4
$ firewall-cmd --permanent --list-interfaces --zone=trusted
ens6 enp2s0f0 ens1 enp22s0 enp4s0 enp6s0f0 eno1 ens2f0 ens1f0 enp80s0f0

Firewalld returns the output of a Python <dict>.keys() call which gives a non random but arbitrary order.

• Firewalld code
• Python docs on dict (note dict.keys redirects to dict.items note)

[crayfishx]

Thanks for the contribution @markeganfuller - this makes sense, I'll verify the above and then get this merged - looks good though.