ipahost: Use new convert_input_certificates

Certificates given by ansible could have leading and trailing white
space, but also multi line input is possible that also could have
leading and training white space and newlines.

plugins/modules/ipahost.py

@@ -510,7 +510,8 @@ host:
 from ansible.module_utils.ansible_freeipa_module import \
     IPAAnsibleModule, compare_args_ipa, gen_add_del_lists, \
     encode_certificate, is_ipv4_addr, is_ipv6_addr, ipalib_errors, \
-    gen_add_list, gen_intersection_list, normalize_sshpubkey
+    gen_add_list, gen_intersection_list, normalize_sshpubkey, \
+    convert_input_certificates
 from ansible.module_utils import six
 if six.PY3:
     unicode = str
@@ -682,13 +683,6 @@ def check_authind(module, auth_ind):
             "by your IPA version" % "','".join(_invalid))
 
 
-def convert_certificate(certificate):
-    if certificate is None:
-        return None
-
-    return [cert.strip() for cert in certificate]
-
-
 # pylint: disable=unused-argument
 def result_handler(module, result, command, name, args, exit_args,
                    single_host):
@@ -894,7 +888,8 @@ def main():
         auth_ind, requires_pre_auth, ok_as_delegate, ok_to_auth_as_delegate,
         force, reverse, ip_address, update_dns, update_password)
 
-    certificate = convert_certificate(certificate)
+    certificate = convert_input_certificates(ansible_module, certificate,
+                                             state)
 
     if sshpubkey is not None:
         sshpubkey = [str(normalize_sshpubkey(key)) for key in sshpubkey]
@@ -982,7 +977,8 @@ def main():
                     ok_to_auth_as_delegate, force, reverse, ip_address,
                     update_dns, update_password)
 
-                certificate = convert_certificate(certificate)
+                certificate = convert_input_certificates(ansible_module,
+                                                         certificate, state)
 
                 if sshpubkey is not None:
                     sshpubkey = [str(normalize_sshpubkey(key)) for