Description of problem:
IPA server upgrade fails with DNS timed out errors when upgraded from 7.0. to 7.3.

Version-Release number of selected component (if applicable):
ipa-server.x86_64 0:4.4.0-9.el7

How reproducible:
Always

Steps to Reproduce:
1. Setup IPA server on RHEL 7.0
2. Setup repo links for RHEL 7.3  in order to upgrade ipa server(in my case ipa-server.x86_64 0:4.4.0-9.el7).
3. Initiate upgrade prcess by running command "yum -y update 'ipa*' sssd"

Actual results:
1. After step3, Yum update process completes successfully, but upgrade fails with following message:
2016-09-07T08:15:47Z ERROR DNS query for auto-hv-01-guest07.testrelm.test. A failed: The DNS operation timed out after 30.0012800694 seconds
2016-09-07T08:15:47Z ERROR IPA server upgrade failed: Inspect /var/log/ipaupgrade.log and run command ipa-server-upgrade manually.
2016-09-07T08:15:47Z DEBUG   File "/usr/lib/python2.7/site-packages/ipapython/admintool.py", line 171, 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 1840, in upgrade
    upgrade_configuration()
  File "/usr/lib/python2.7/site-packages/ipaserver/install/server/upgrade.py", line 1724, in upgrade_configuration
    named_update_global_forwarder_policy(),
  File "/usr/lib/python2.7/site-packages/ipaserver/install/server/upgrade.py", line 843, in named_update_global_forwarder_policy
    if not dnsutil.has_empty_zone_addresses(api.env.host):
  File "/usr/lib/python2.7/site-packages/ipapython/dnsutil.py", line 278, in has_empty_zone_addresses
    ip_addresses = resolve_ip_addresses(hostname)
  File "/usr/lib/python2.7/site-packages/ipapython/dnsutil.py", line 328, in resolve_ip_addresses
    rrsets = resolve_rrsets(fqdn, ['A', 'AAAA'])
  File "/usr/lib/python2.7/site-packages/ipapython/dnsutil.py", line 305, in resolve_rrsets
    answer = dns.resolver.query(fqdn, rdtype)
  File "/usr/lib/python2.7/site-packages/dns/resolver.py", line 1027, in query
    raise_on_no_answer, source_port)
  File "/usr/lib/python2.7/site-packages/dns/resolver.py", line 947, in query
    timeout = self._compute_timeout(start)
  File "/usr/lib/python2.7/site-packages/dns/resolver.py", line 769, in _compute_timeout
    raise Timeout(timeout=duration)
 
2016-09-07T08:15:47Z DEBUG The ipa-server-upgrade command failed, exception: Timeout: The DNS operation timed out after 30.0012800694 seconds
2016-09-07T08:15:47Z ERROR Unexpected error - see /var/log/ipaupgrade.log for details:
Timeout: The DNS operation timed out after 30.0012800694 seconds
2016-09-07T08:15:47Z ERROR The ipa-server-upgrade command failed. See /var/log/ipaupgrade.log for more information 

Expected results:
No error messages should be observed during upgrade process.