ns0.euwest.azure stops responding for internal.admin.swh.network when pergamon is unreachable

The SOA TTLs for internal.admin.swh.network were set before they were updated in puppet, with the old (way too low) values.

Update them with decent values instead:

olasd@pergamon:~$ (echo update add internal.admin.swh.network 86400 IN SOA pergamon.internal.softwareheritage.org. sysop.softwareheritage.org. 19 3600 120 604800 120; echo send) | sudo nsupdate -k /etc/bind/keys/local-update

(19 is a valid serial for this zone)

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Migrated from T4439 (view on Phabricator)