Merge ALTER GROUP ADD/DROP rules by creating add_drop action.

Bruce Momjian <bruce@momjian.us>

Commit: 10f05d81273a9fa35878a4fc75b8dacca0b15dcc
Author: Bruce Momjian <bruce@momjian.us>
Date: 2002-06-17T07:00:27Z
Releases: 7.3.1
Merge ALTER GROUP ADD/DROP rules by creating add_drop action.

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