Use safer default TIMESTAMP.

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)
-);
+);