Description of problem:ipa trust-add with raw option gives internal error.

Version-Release number of selected component (if applicable):
ipa-server-dns-4.4.0-1.el7.noarch
ipa-server-trust-ad-4.4.0-1.el7.x86_64
ipa-server-4.4.0-1.el7.x86_64

How reproducible: Always

Steps to Reproduce:
1. install ipa-server
2. run ipa-adtrust-install
3. now establish external trust with --raw option

Actual results:
[root@server samba]# ipa trust-add --type='ad' --range-type='ipa-ad-trust'
--two-way=true --external=true  --raw
Realm name: pne.qe
Active Directory domain administrator: administrator
Active Directory domain administrator's password:
ipa: ERROR: an internal error has occurred

===cat /var/log/httpd/error_log===
[Mon Jul 11 13:43:28.568276 2016] [:error] [pid 15623] ipa: INFO:
[jsonserver_kerb] admin@TESTRELM.TEST: trust_add/1(u'pne.qe', trust_type=u'ad',
realm_admin=u'administrator', realm_passwd=u'********',
range_type=u'ipa-ad-trust', bidirectional=True, external=True, all=True,
raw=True, version=u'2.210'): KeyError
[Mon Jul 11 13:43:36.015919 2016] [:error] [pid 15624] ipa: INFO:
[jsonserver_kerb] admin@TESTRELM.TEST: trust_find/1(None, version=u'2.210'):
SUCCESS
[Mon Jul 11 13:44:40.087057 2016] [:error] [pid 15623] ipa: INFO:
[jsonserver_kerb] admin@TESTRELM.TEST: trust_del/1((u'pne.qe',),
version=u'2.210'): SUCCESS
[Mon Jul 11 13:46:29.644247 2016] [:error] [pid 15624] ipa: ERROR: non-public:
KeyError: 'ipanttrusttype'
[Mon Jul 11 13:46:29.644275 2016] [:error] [pid 15624] Traceback (most recent
call last):
[Mon Jul 11 13:46:29.644287 2016] [:error] [pid 15624]   File
"/usr/lib/python2.7/site-packages/ipaserver/rpcserver.py", line 352, in
wsgi_execute
[Mon Jul 11 13:46:29.644289 2016] [:error] [pid 15624]     result =
self.Command[name](*args, **options)
[Mon Jul 11 13:46:29.644291 2016] [:error] [pid 15624]   File
"/usr/lib/python2.7/site-packages/ipalib/frontend.py", line 447, in __call__
[Mon Jul 11 13:46:29.644294 2016] [:error] [pid 15624]     return
self.__do_call(*args, **options)
[Mon Jul 11 13:46:29.644296 2016] [:error] [pid 15624]   File
"/usr/lib/python2.7/site-packages/ipalib/frontend.py", line 475, in __do_call
[Mon Jul 11 13:46:29.644298 2016] [:error] [pid 15624]     ret =
self.run(*args, **options)
[Mon Jul 11 13:46:29.644299 2016] [:error] [pid 15624]   File
"/usr/lib/python2.7/site-packages/ipalib/frontend.py", line 797, in run
[Mon Jul 11 13:46:29.644301 2016] [:error] [pid 15624]     return
self.execute(*args, **options)
[Mon Jul 11 13:46:29.644303 2016] [:error] [pid 15624]   File
"/usr/lib/python2.7/site-packages/ipaserver/plugins/trust.py", line 767, in
execute
[Mon Jul 11 13:46:29.644305 2016] [:error] [pid 15624]
result['result']['ipanttrusttype'][0], attributes)]
[Mon Jul 11 13:46:29.644307 2016] [:error] [pid 15624] KeyError:
'ipanttrusttype'

Expected results:
Although the trust gets established properly without any issues, we need to fix
the internal error displayed on the console.

Additional info: