Use safer default TIMESTAMP for MySQL. (#3424)

This avoids compatibility issues with differing versions of MySQL.

Using 24 hours after the minimum timestamp value allows for any timezone adjustment that MySQL would do to get a UTC value before storing. The timezone suffix is not supported by all current MySQL versions/derivatives.

Fixes #119

schema/mysql/v57/temporal/versioned/v1.0/schema.sql

@@ -248,13 +248,13 @@ CREATE TABLE cluster_membership
     rpc_address          VARCHAR(15) NOT NULL,
     rpc_port             SMALLINT NOT NULL,
     role                 TINYINT NOT NULL,
-    session_start        TIMESTAMP DEFAULT '1970-01-01 00:00:01+00:00',
-    last_heartbeat       TIMESTAMP DEFAULT '1970-01-01 00:00:01+00:00',
-    record_expiry        TIMESTAMP DEFAULT '1970-01-01 00:00:01+00:00',
+    session_start        TIMESTAMP DEFAULT '1970-01-02 00:00:01',
+    last_heartbeat       TIMESTAMP DEFAULT '1970-01-02 00:00:01',
+    record_expiry        TIMESTAMP DEFAULT '1970-01-02 00:00:01',
     INDEX (role, host_id),
     INDEX (role, last_heartbeat),
     INDEX (rpc_address, role),
     INDEX (last_heartbeat),
     INDEX (record_expiry),
     PRIMARY KEY (membership_partition, host_id)
-);
+);