Swift fails to start after updating/upgrading Red Hat Gluster Storage to 3.1

Issue

• Restarting Swift fails after upgrading/updating Red Hat Gluster Storage to 3.1

  [root@server swift]# swift-init main restart
  Signal proxy-server  pid: 6311  signal: 15
  No proxy-server running
  Signal container-server  pid: 6312  signal: 15
  No container-server running
  Signal account-server  pid: 6313  signal: 15
  No account-server running
  Signal object-server  pid: 6314  signal: 15
  No object-server running
  Starting proxy-server...(/etc/swift/proxy-server.conf)
  Starting container-server...(/etc/swift/container-server.conf)
  Starting account-server...(/etc/swift/account-server.conf)
  Starting object-server...(/etc/swift/object-server.conf)
  Error trying to load config from /etc/swift/proxy-server.conf: No module named gluster.swift.proxy.server
  Error trying to load config from /etc/swift/container-server.conf: No module named gluster.swift.container.server
  Error trying to load config from /etc/swift/account-server.conf: No module named gluster.swift.account.server
  Error trying to load config from /etc/swift/object-server.conf: No module named gluster.swift.obj.server