[patch] use macro in setup script

Hi, everyone,

I found that in script postgresql-11-setup,  there are some codes

# Log file for pg_upgrade

PGUPLOG=/var/lib/pgsql/$PGMAJORVERSION/pgupgrade.log

# Log file for initdb

PGLOG=/var/lib/pgsql/11/initdb.log

Maybe using macro $PGMAJORVERSION is better instead of using 11 directly.

And I found that in postgresql-11-setup, this problem has been modified by this commit.

So, patch is attached

Regards;

Shenhao, Wang

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Shenhao, Wang

DX3

Nanjing Fujitsu Nanda Software Tech. Co., Ltd.(FNST)

EMail:wangsh.fnst@cn.fujitsu.com