Description of problem:
This is a possible regression of https://bugzilla.redhat.com/show_bug.cgi?id=826677

Initial topology:  (single replication)
  1
  |
  2

Version-Release number of selected component (if applicable):
ipa-server-3.3.1-1.el7.x86_64

How reproducible:
alweays

Steps to Reproduce:
#. on host 1
1. ipa-server-install 
2. ipa-replica-prepare --ip-address=<ip of host 2> host2
#. on host 2
3. ipa-replica-install <gpg-file>
#. on host 1
4. ipa-replica-manage disconnect $HOST1 $HOST2
# on host2:
5.  ipa-server-install --uninstall -U
# on host1:
5.  ipa-replica-prepare -p $ADMINPW --ip-address=$HOST2_IP $HOST2
# on host2:
6.  cd /dev/shm; sftp root@$HOST1:/var/lib/ipa/replica-info-$HOST2.gpg
7.  ipa-replica-install -U --setup-dns --forwarder=$DNSFORWARD -w $ADMINPW -p $ADMINPW /dev/shm/replica-info-$HOST2.gpg


Actual results:
[root@ipaqavme ~]# ipa host-del --updatedns ipaqavmf.testrelm.com
ipa: ERROR: invalid 'hostname': An IPA master host cannot be deleted or disabled
[root@ipaqavme ~]# ipa-replica-manage del ipaqavmf.testrelm.com --force
Connection to 'ipaqavmf.testrelm.com' failed: 
Forcing removal of ipaqavmf.testrelm.com
Skipping calculation to determine if one or more masters would be orphaned.
No RUV records found.
[root@ipaqavme ~]# ipa host-del --updatedns ipaqavmf.testrelm.com
ipa: ERROR: invalid 'hostname': An IPA master host cannot be deleted or disabled


Additional info:

I am able to work-around this problem by following the instructions noted in comment 15 from BZ 826677, ith this command:
[root@ipaqavme ~]# ldapdelete -r -x -D "cn=Directory Manager" -W 'cn=ipaqavmf.testrelm.com,cn=masters,cn=ipa,cn=etc,dc=testrelm,dc=com'
Enter LDAP Password: 

[root@ipaqavme ~]# ldapsearch -x -LLL -D "cn=Directory Manager" -W -b 'cn=ipaqavmf.testrelm.com,cn=masters,cn=ipa,cn=etc,dc=testrelm,dc=com'
Enter LDAP Password: 
No such object (32)
Matched DN: cn=masters,cn=ipa,cn=etc,dc=testrelm,dc=com