Re-initialize NSS database after otptoken plugin tests

OTP token tests do not properly reinitialize the NSS db, thus
making subsequent xmlrpc tests fail on SSL cert validation.

Make sure NSS db is re-initalized in the teardown method.

https://fedorahosted.org/freeipa/ticket/4748

Reviewed-By: Petr Viktorin <pviktori@redhat.com>

ipatests/test_ipaserver/test_otptoken_import.py

@@ -21,12 +21,17 @@ import os
 import sys
 import nose
 from nss import nss
+from ipalib.x509 import initialize_nss_database
 
 from ipaserver.install.ipa_otptoken_import import PSKCDocument, ValidationError
 
 basename = os.path.join(os.path.dirname(__file__), "data")
 
 class test_otptoken_import(object):
+
+    def teardown(self):
+        initialize_nss_database()
+
     def test_figure3(self):
         doc = PSKCDocument(os.path.join(basename, "pskc-figure3.xml"))
         assert doc.keyname is None