- The setting of "ENV{'TZ'}" doesn't affect the timezone
  used by MySQL Server on Windows.
- Explicitly set timezone in test cases before doing UTC/localtime
  conversions so tests produce deterministic results


mysql-test/r/func_timestamp.result:
  Update test results
mysql-test/r/type_timestamp.result:
  Update test results
mysql-test/t/func_timestamp.test:
  Specifically set timezone to make tests that do localtime/UTC conversions deterministic
mysql-test/t/type_timestamp.test:
  Specifically set timezone to make tests that do localtime/UTC conversions deterministic