REPACK (CONCURRENTLY) fails when table owner lacks CONNECT

[Nathan Bossart]

The REPACK decoding worker doesn't pass BGWORKER_BYPASS_ALLOWCONN like
parallel.c does, so it can fail to start.  Here is a reproducer:

    CREATE DATABASE d;
    REVOKE CONNECT ON DATABASE d FROM PUBLIC;
    \c d
    CREATE ROLE r NOLOGIN;
    CREATE TABLE t (a INT PRIMARY KEY);
    ALTER TABLE t OWNER TO r;
    REPACK t; -- works
    REPACK (CONCURRENTLY) t; -- fails

That last command produces the following output:

    ERROR:  permission denied for database "d"
    DETAIL:  User does not have CONNECT privilege.
    CONTEXT:  REPACK decoding worker

This one seems easy enough to fix.

-- 
nathan