Add SecurePoll specific dblist and allow SecurePoll to use

* To allow for the separate manipulation of what is considered a 'global' election for SecurePoll purposes.
* Initially needed because of Bug: 72569 which requires us to get rid of labswiki.
* I also removed loginwiki and zerowiki because those should not be voted from.
* For now leaving decisions about chapter wikis etc for the board election committee later.
* Add record for SecurePoll to use as list of wikis.

Bug: 73245
Change-Id: I831203bdb5db7df79032edaf447be41ecf55c287