Tests: Remove usage of krb5 ccache from test_ipaserver/test_ldap

In test_ipaserver/test_ldap::test_ldap::test_GSSAPI a krb5 ccache is used to
connect to ldap. The test tries to locate this cache in /tmp/krb5cc_$UID file,
which is not there due to default settings in krb5.conf, and hence the whole
test is skipped. Fix the test to use keyring to connect instead of ccache in
/tmp.

https://fedorahosted.org/freeipa/ticket/6323

Reviewed-By: Martin Basti <mbasti@redhat.com>

ipatests/test_ipaserver/test_ldap.py

@@ -37,7 +37,6 @@ import six
 from ipaserver.plugins.ldap2 import ldap2
 from ipalib import api, x509, create_api, errors
 from ipapython import ipautil
-from ipaplatform.paths import paths
 from ipapython.dn import DN
 
 if six.PY3:
@@ -53,7 +52,6 @@ class test_ldap(object):
     def setup(self):
         self.conn = None
         self.ldapuri = 'ldap://%s' % ipautil.format_netloc(api.env.host)
-        self.ccache = paths.TMP_KRB5CC % os.getuid()
         nss.nss_init_nodb()
         self.dn = DN(('krbprincipalname','ldap/%s@%s' % (api.env.host, api.env.realm)),
                      ('cn','services'),('cn','accounts'),api.env.basedn)
@@ -77,10 +75,8 @@ class test_ldap(object):
         """
         Test a GSSAPI LDAP bind using ldap2
         """
-        if not ipautil.file_exists(self.ccache):
-            raise nose.SkipTest('Missing ccache %s' % self.ccache)
         self.conn = ldap2(api, ldap_uri=self.ldapuri)
-        self.conn.connect(ccache='FILE:%s' % self.ccache)
+        self.conn.connect()
         entry_attrs = self.conn.get_entry(self.dn, ['usercertificate'])
         cert = entry_attrs.get('usercertificate')
         cert = cert[0]