Expanded the test case for bug #6120 to cover
  DROP VIEW / CREATE VIEW scenario.
sql_view.cc:
  Expanded the fix for bug #6120 to cover the case of
  DROP VIEW / CREATE_VIEW.


sql/sql_view.cc:
  Expanded the fix for bug #6120 to cover the case of
  DROP VIEW / CREATE_VIEW.
mysql-test/r/view.result:
  Expanded the test case for bug #6120 to cover
  DROP VIEW / CREATE VIEW scenario.
mysql-test/t/view.test:
  Expanded the test case for bug #6120 to cover
  DROP VIEW / CREATE VIEW scenario.