BUG #6176: pg_dump dumps pg_catalog tables

The following bug has been logged online:

Bug reference:      6176
Logged by:          Chander Ganesan
Email address:      chander@otg-nc.com
PostgreSQL version: 9.0.4
Operating system:   Centos 5.6
Description:        pg_dump dumps pg_catalog tables
Details:

Normally, the pg_dump command ignored the pg_catalog tables when performing
a dump.  However, when provided the '--table' argument it fails to ignore
the pg_catalog table.

For example, suppose I had tables p1-p10 that I wanted to dump, I could use
the following command:

pg_dump test_db --table 'p*'

This command would dump the requested tables, but it would also dump all the
tables (in all schemas) that start with 'p*' .  Generally speaking, there
are no "excluded schemas" when using the pg_dump command with the '--table'
argument.

It is my belief that the pg_catalog tables should almost always be ignored
(lest restores fail miserably).