mysql_adaptor: remove unused AF_USER_OUTOFDATE

This enumerator was historically used to flag accounts that have
exceeded the `end_day` column, but it was never used by Gromox.

References: GXL-435

include/gromox/mysql_adaptor.hpp

@@ -11,7 +11,6 @@ enum {
  /* Reason codes (users.address_status) for forbidden login */
  AF_USER_NORMAL = 0x00,
  AF_USER_SUSPENDED = 0x01,
- AF_USER_OUTOFDATE = 0x02,
  AF_USER_DELETED = 0x03,
  AF_USER_SHAREDMBOX = 0x04,
  AF_USER_CONTACT = 0x05,
@@ -20,7 +19,6 @@ enum {
  // historically: groups with AF_GROUP__MASK = 0xC0, with statuses NORMAL..DELETED
  AF_DOMAIN_NORMAL = 0x00,
  AF_DOMAIN_SUSPENDED = 0x10,
- AF_DOMAIN_OUTOFDATE = 0x20,
  AF_DOMAIN_DELETED = 0x30,
  AF_DOMAIN__MASK = 0x30,