changelog: fix links to tox and py.test web pages
changelog: fix links to tox and py.test web pages

Change-Id: If03fd0797ececcbfaf4b7bbdd0684a329c15b281

aldebaran/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild