After upgrading from 7.3 to 7.4 ipa-server-upgrade script fails with the error : " wait_for_open_ports: localhost [8080, 8443] timeout 300"

Issue

After upgrading from 7.3 to 7.4 ipa-server-upgrade script fails with the error : " wait_for_open_ports: localhost [8080, 8443] timeout 300".

We see the following errors in /var/log/ipaupgrade.log

2017-08-15T17:49:12Z DEBUG Process finished, return code=0
2017-08-15T17:49:12Z DEBUG stdout=
2017-08-15T17:49:12Z DEBUG stderr=
2017-08-15T17:49:12Z DEBUG Starting external process
2017-08-15T17:49:12Z DEBUG args=/bin/systemctl is-active pki-tomcatd@pki-tomcat.service
2017-08-15T17:49:12Z DEBUG Process finished, return code=0
2017-08-15T17:49:12Z DEBUG stdout=active

2017-08-15T17:49:12Z DEBUG stderr=
2017-08-15T17:49:12Z DEBUG wait_for_open_ports: localhost [8080, 8443] timeout 300
2017-08-15T17:54:12Z ERROR IPA server upgrade failed: Inspect /var/log/ipaupgrade.log and run command ipa-server-upgrade manually.
2017-08-15T17:54:12Z DEBUG   File "/usr/lib/python2.7/site-packages/ipapython/admintool.py", line 172, in execute
    return_value = self.run()
  File "/usr/lib/python2.7/site-packages/ipaserver/install/ipa_server_upgrade.py", line 46, in run
    server.upgrade()
  File "/usr/lib/python2.7/site-packages/ipaserver/install/server/upgrade.py", line 1913, in upgrade
    upgrade_configuration()
  File "/usr/lib/python2.7/site-packages/ipaserver/install/server/upgrade.py", line 1646, in upgrade_configuration
    upgrade_pki(ca, fstore)
  File "/usr/lib64/python2.7/contextlib.py", line 24, in __exit__
    self.gen.next()
  File "/usr/lib/python2.7/site-packages/ipaserver/install/installutils.py", line 1134, in stopped_service
    service_obj.start(instance_name)
  File "/usr/lib/python2.7/site-packages/ipaplatform/redhat/services.py", line 211, in start
    instance_name, capture_output=capture_output, wait=wait)
  File "/usr/lib/python2.7/site-packages/ipaplatform/base/services.py", line 300, in start
    self.wait_for_open_ports(self.service_instance(instance_name))
  File "/usr/lib/python2.7/site-packages/ipaplatform/base/services.py", line 270, in wait_for_open_ports
    self.api.env.startup_timeout)
  File "/usr/lib/python2.7/site-packages/ipapython/ipautil.py", line 1227, in wait_for_open_ports
    raise socket.timeout("Timeout exceeded")