Restrict name list len for domain constraints

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 6630420fc9139c3a1ee051bc2f2ae8fa32e71c62
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2014-12-26T17:31:37Z
Releases: 9.5.0
Restrict name list len for domain constraints

This avoids an ugly-looking "cache lookup failure" message.

Ugliness pointed out by Andres Freund.

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