esams/knams: advertise 188.8.131.52/23 instead of 184.108.40.206/22
220.127.116.11/23 is now used/reserved for cloud services in eqiad/codfw,
esams/knams needs to not include it in its advertised prefix
(currently advertise the whole 18.104.22.168/22).
The advertised WMCS prefix is more specific there are no operational difference
(no expected impact) in changing the prefix out of esams/knams.