add missing terminal dot for analytics102[12] IPv6

fix warnings like

In rrset '1.2.1.0.6.3.0.0.4.6.0.0.0.1.0.0.6.0.1.0.1.6.8.0.0.0.0.0.0.2.6.2.ip6.arpa. PTR', same-zone target
                 'analytics1021.eqiad.wmnet.6.0.1.0.1.6.8.0.0.0.0.0.0.2.6.2.ip6.arpa.' has no addresses
In rrset '2.2.1.0.6.3.0.0.4.6.0.0.0.1.0.0.6.0.1.0.1.6.8.0.0.0.0.0.0.2.6.2.ip6.arpa. PTR', same-zone target
                 'analytics1022.eqiad.wmnet.6.0.1.0.1.6.8.0.0.0.0.0.0.2.6.2.ip6.arpa.' has no addresses

Change-Id: I6acc960002fa56fd1ae75eb1b468436affe6b58d