Jeremy Felt e7f4d926c9 Multisite: Only query for one site in domain_exists().
`get_sites()` queries for a maximum of 100 records by default. In `domain_exists()`, we only use one.

A previous commit, [41736], has this same commit message but applies to `get_blog_id_from_url()` and #42073 instead.

Props danieltj, spacedmonkey.
Fixes #42072.


git-svn-id: https://develop.svn.wordpress.org/trunk@41738 602fd350-edb4-49c9-b593-d223f7449a82
2017-10-04 16:25:07 +00:00
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