Allow Almanac namespaces to be searched by ngram index
Summary: Ref T6741. Ref T10246. This is largely modernization, but will partially support namespace locking in Almanac.
Test Plan:
Searched for Almanac networks by name substring.
{F1121740}
Reviewers: chad
Reviewed By: chad
Maniphest Tasks: T6741, T10246
Differential Revision: https://secure.phabricator.com/D15322