clean up SHOW GRANTS so it will show host-names with case as entered.
make REVOKE and friends case-sensitive to make things more intuitive.
Patch by Martin Friebe.


mysql-test/r/grant.result:
  Bug#19828: Case sensitivity in hostname leads to inconsistent behavior
  
  clean up after test so random order of tests is possible
mysql-test/r/grant3.result:
  Bug#19828: Case sensitivity in hostname leads to inconsistent behavior
  
  Show that REVOKE, SHOW GRANTS etc. are now consistently case-sensitive.
mysql-test/t/grant.test:
  Bug#19828: Case sensitivity in hostname leads to inconsistent behavior
  
  clean up after test so random order of tests is possible
mysql-test/t/grant3.test:
  Bug#19828: Case sensitivity in hostname leads to inconsistent behavior
  
  Show that REVOKE, SHOW GRANTS etc. are now consistently case-sensitive.