Fix login issue for HyperDB

If using HyperDB, or any advanced database plugin that allows for Writer/Reader configurations, for your WordPress setup, you may notice a common issue with logins not working properly. The issue here is the latency from the Writer DB and the Read Replicas. To resolve this issue, just add a sleep for 1 second. I have this used on my production environments and the login issue is now gone.

\add_action('wp_login', 'delayLoginForDBReplicationLag');
/**
 * Due to the latency from Writer to Reader, we need to delay login so the user is properly logged in
 */
function delayLoginForDBReplicationLag() {
    sleep(1);
}