Reduce output of the SHOW GRANTS command

[TreeHunter9]

From:

GRANT SELECT, UPDATE (PLG$ACTIVE) ON PLG$VIEW_USERS TO PUBLIC
GRANT UPDATE (PLG$FIRST_NAME) ON PLG$VIEW_USERS TO PUBLIC
GRANT UPDATE (PLG$GID) ON PLG$VIEW_USERS TO PUBLIC
GRANT UPDATE (PLG$GROUP_NAME) ON PLG$VIEW_USERS TO PUBLIC
GRANT UPDATE (PLG$LAST_NAME) ON PLG$VIEW_USERS TO PUBLIC
GRANT UPDATE (PLG$MIDDLE_NAME) ON PLG$VIEW_USERS TO PUBLIC
GRANT UPDATE (PLG$PASSWD) ON PLG$VIEW_USERS TO PUBLIC
GRANT UPDATE (PLG$UID) ON PLG$VIEW_USERS TO PUBLIC

GRANT DELETE, INSERT, SELECT, UPDATE, REFERENCES ON PLG$USERS TO VIEW PLG$VIEW_USERS

To:

GRANT SELECT, UPDATE (PLG$FIRST_NAME, PLG$GID, PLG$GROUP_NAME, PLG$LAST_NAME, PLG$MIDDLE_NAME, PLG$PASSWD, PLG$UID) ON PLG$VIEW_USERS TO PUBLIC

GRANT ALL ON PLG$USERS TO VIEW PLG$VIEW_USERS

[dyemanov]

I see no problems with this PR. Unless anyone else objects, I will merge it over the weekend.