[dns-operations] A few more long-term name-collision sentinel gTLDs

[Viktor Dukhovni]

The below have all been delegated for some time, and yet the name
collision sentinels are still in place:

example.etisalat.       A       127.0.53.53
example.arab.           A       127.0.53.53
example.xn--mgbaakc7dvf. A      127.0.53.53
example.xn--mxtq1m.     A       127.0.53.53
example.xn--ngbrx.      A       127.0.53.53
example.politie.        A       127.0.53.53

Is that intentional, or neglected cleanup?

-- 
	Viktor.