tests/example: use .example TLD to prevent lookups

Tests were using mywebsite.me, which is an existing domain for which
HTTP requests timeout, this make the test slow and it is generally not OK
that the test use a real web site. Using .example, as recommended by rfc2606
prevent these problems.

slapos-proxy.cfg.example

@@ -47,7 +47,7 @@ software_product_list =
 #     "master_url" that will be used by the slapproxy to forward the request.
 
 
-# Uncomment the sections bellow to enable multi-master sections, adter set
+# Uncomment the sections bellow to enable multi-master sections, and set
 # your cert/key.
 #[multimaster/https://slap.vifib.com]
 #key = key file path coming from your slapos master account
@@ -55,8 +55,8 @@ software_product_list =
 #software_release_list =
 #  http://git.erp5.org/gitweb/slapos.git/blob_plain/HEAD:/software/apache-frontend/software.cfg
 
-#[multimaster/http://imaginary-slapos-master.com]
+#[multimaster/http://imaginary-slapos-master.example]
 # No certificate here: it is http.
 #software_release_list =
-#  http://mywebsite.me/my_software_release.cfg
+#  http://slapos.example/my_software_release.cfg
 #  /some/arbitrary/local/unix/path

slapos/tests/test_slapproxy.py

@@ -1685,8 +1685,8 @@ class TestMultiMasterSupport(MasterMixin):
   """
   Test multimaster support in slapproxy.
   """
-  external_software_release = 'http://mywebsite.me/exteral_software_release.cfg'
-  software_release_not_in_list = 'http://mywebsite.me/exteral_software_release_not_listed.cfg'
+  external_software_release = 'http://slapos.example/external_software_release.cfg'
+  software_release_not_in_list = 'http://slapos.example/external_software_release_not_listed.cfg'
 
   def setUp(self):
     self.addCleanup(self.stopExternalProxy)

slapos/tests/test_slapproxy/slapos_multimaster.cfg.in

@@ -25,7 +25,7 @@ software_release_list =
 [multimaster/http://%(external_proxy_host)s:%(external_proxy_port)s]
 # No certificate here: it is http.
 software_release_list =
-  http://mywebsite.me/exteral_software_release.cfg
+  http://slapos.example/external_software_release.cfg
 
 # Request as a computer partition, so that requested partitions are linked
 # to the partition requesting them.