Drop support and testing for Django 1.1

[frenzymadness]

In #537, we have removed support for Python 2.7 on EL 7 which means that this test is now useless:

s2i-python-container/test/run

Lines 232 to 239 in 625f3a6

	# The latest LTS release of Django does not work on RHEL 7 (due to an old version of SQLite),
	# and no longer supports Python 2. So on all CentOS/RHEL 7 images and all Python 2 images,
	# we're using the old Django LTS version 1.11.x from the main git branch of the django-ex project.
	# In all other cases we're using the newer Django LTS version 2.2.x from the corresponding git branch.
	{% raw %}
	if [[ ${VERSION} == "2.7" ]] || docker inspect ${IMAGE_NAME} --format "{{.Config.Env}}" | tr " " "\n" | grep -q "^PLATFORM=el7"; then
	{% endraw %}
	django_example_repo_url="https://github.com/sclorg/django-ex.git"

We can remove it from the sources here but it makes me think about what to do with the django-ex project. If the master branch of django-ex is not used anymore anywhere it might make sense to make it a signpost with links to other branches and remove the obsoleted source code.

What do you think @phracek @pkubatrh @hhorak ?

[frenzymadness]

PR #761 hopefully drops the last usage of the master branch here, and then we can proceed and update the django-ex project.