tests.slap: use different hostnames for navigator tests

Since 65f73750 the URLs are cached, so
test was failing because they were not isolated.

slapos/tests/slap.py

@@ -393,7 +393,7 @@ class TestSlap(SlapMixin):
                 }
 
     with httmock.HTTMock(handler):
-      self.slap.initializeConnection('http://bar')
+      self.slap.initializeConnection('http://%s' % self.id())
     self.assertEqual(
         self.slap._hateoas_navigator.slapos_master_hateoas_uri,
         hateoas_url
@@ -411,7 +411,7 @@ class TestSlap(SlapMixin):
         self.fail('slap should not have contacted master to get Hateoas URL.')
 
     with httmock.HTTMock(handler):
-      self.slap.initializeConnection('http://bar', slapgrid_rest_uri=hateoas_url)
+      self.slap.initializeConnection('http://%s' % self.id(), slapgrid_rest_uri=hateoas_url)
     self.assertEqual(
         self.slap._hateoas_navigator.slapos_master_hateoas_uri,
         hateoas_url
@@ -431,9 +431,10 @@ class TestSlap(SlapMixin):
                 }
 
     with httmock.HTTMock(handler):
-      self.slap.initializeConnection('http://bar')
+      self.slap.initializeConnection('http://%s' % self.id())
     self.assertEqual(None, getattr(self.slap, '_hateoas_navigator', None))
 
+
 class TestComputer(SlapMixin):
   """
   Tests slapos.slap.slap.Computer class functionality