Update CONNECT version number and date.

modified:
  mysql-test/suite/connect/r/null.result
  mysql-test/suite/connect/r/xml.result
  mysql-test/suite/connect/t/null.test
  storage/connect/ha_connect.cc
  storage/connect/mycat.cc
  storage/connect/tabdos.cpp
  storage/connect/tabfix.cpp
  storage/connect/tabfmt.cpp
  storage/connect/tabtbl.cpp
  storage/connect/tabvct.cpp