travis: replace unreachable logo URL

travis said
ERROR: tests.004-test-client.test_008
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/home/travis/virtualenv/python2.7.14/lib/python2.7/site-packages/nose/case.py", line 197, in runTest
    self.test(*self.arg)
  File "/home/travis/virtualenv/python2.7.14/lib/python2.7/site-packages/nose/util.py", line 620, in newfunc
    return func(*arg, **kw)
  File "/home/travis/build/benoitc/restkit/tests/t.py", line 73, in run
    func(self.url, cli)
  File "/home/travis/build/benoitc/restkit/tests/004-test-client.py", line 129, in test_008
    r = c.request(u)
  File "/home/travis/build/benoitc/restkit/restkit/client.py", line 416, in request
    return self.perform(request)
  File "/home/travis/build/benoitc/restkit/restkit/client.py", line 352, in perform
    raise RequestError(str(e))
RequestError: [Errno -2] Name or service not known
-------------------- >> begin captured logging << --------------------
restkit.client: DEBUG: Start to perform request: e-engura.com GET /images/logo.gif

$ host www.e-engura.com
Host www.e-engura.com not found: 3(NXDOMAIN)

$ host e-engura.com
Host e-engura.com not found: 3(NXDOMAIN)

Author: bmwiedemann

tests/004-test-client.py

@@ -112,7 +112,7 @@ def test_006(u, c):
     t.eq(r.body_string(), "ok")
 
 
-@t.client_request('http://e-engura.com/images/logo.gif')
+@t.client_request('http://www.lsmod.de/~bernhard/mirror/e-engura.com/images/logo.gif')
 def test_007(u, c):
     r = c.request(u)
     print r.status
@@ -124,7 +124,7 @@ def test_007(u, c):
     t.eq(imghdr.what(fname), 'gif')
 
 
-@t.client_request('http://e-engura.com/images/logo.gif')
+@t.client_request('http://www.lsmod.de/~bernhard/mirror/e-engura.com/images/logo.gif')
 def test_008(u, c):
     r = c.request(u)
     t.eq(r.status_int, 200)