BUG #14298: service upgrade not setting ports

The following bug has been logged on the website:

Bug reference: 14298
Logged by: Jason Christy
Email address: jason(dot)christy(at)pnnl(dot)gov
PostgreSQL version: 9.5.4
Operating system: Red Hat Enterprise 6
Description:

In /etc/init.d/postgresql-9.5, the upgrade section searches it's init.d
script for the "PGPORT" variable with the following:

# Get port number and data directory of the old instance from the init
script
OLDPGDATA=` sed -n 's/^PGDATA=//p'
/etc/init.d/postgresql-$PGPREVMAJORVERSION`
OLDPGPORT=`sed -n 's/^PGPORT=//p'
/etc/init.d/postgresql-$PGPREVMAJORVERSION`

# Get port number and data directory of the new instance from the init
script
NEWPGDATA=` sed -n 's/^PGDATA=//p' /etc/init.d/postgresql-$PGMAJORVERSION`
NEWPGPORT=`sed -n 's/^PGPORT=//p' /etc/init.d/postgresql-$PGMAJORVERSION`

1) The PGPORT variable is not set in /etc/init.d/postgresql-9.5
2) There is a comment in the init.d script:
# Version 9.4.0 Devrim Gunduz <devrim(at)gunduz(dot)org>
# Remove PGPORT variable.

In order for me to "upgrade" postgresql from v9.4 to v9.5, I have to
manually run the pg_upgrade script.