in certain cases

GRANT OPTION is both a separate option and part of the internal mask used
when parsing an ALL PRIVILEGES privilege.
Thus when parsing GRANT ALL PRIVILEGES/REVOKE 
ALL PRIVILEGES we need to remove the GRANT OPTION from the mask.
And we also need a special command to deal with 
REVOKE ALL PRIVILEGES,GRANT OPTION because of that removal.

However, the fact that a crefully crafted list of individual privileges can 
produce the same list as ALL PRIVILEGES, GRANT OPTION was omitted
and thus the special command wasn't used in this case, causing a removal
of the GRANT OPTION mask in REVOKE.
Fixed by checking for this special case in parsing REVOKE and using the 
proper internal command for it.
Also noted that the syntax errors in the parser for constructs like 
REVOKE ... FROM ... IDENTIFIED ... were pratcially turned off and fixed
that by setting the right SQL command early in the parser so that the
additional checks can operate. Added proper error generation as these
checks were rotting away being turned off for some time.
Test cases added.
Fixed test cases that were expecting wrong errors for
REVOKE .. FROM .. IDENTIFIED ...