Fix error configuration for container/object-server.conf

In the sections:
Edit the /etc/swift/container-server.conf file and complete the
following actions:

[pipeline:main]
pipeline = healthcheck recon account-server

account-server should read: healthcheck recon container-server

and

Edit the /etc/swift/object-server.conf file and complete the following
actions:

[pipeline:main]
pipeline = healthcheck recon account-server

account-server should be object-server

backport: juno

Change-Id: I43d298ae1dbde56835c7db03e985eaf5351c43cf
Closes-bug: #1398131
(cherry picked from commit d50cb60f8533e703f8a9973da720151d90402303)