Srdjan 46cfde3d95 MDL-19711 dml: Enable use of readonly slave database handles
Implemented with moodle_read_slave_trait

Functionality is triggered by supplying config dboption['readonly'].
See config-dist.php for more info on supported dboptions.

pgsql and mysqli drivers are using this feature. Also added support for
connection timeout for these two drivers.
2020-05-19 11:50:42 +10:00
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