Fix CI (1/2) (#284)

* New default docker image no longer contains bcrypt.

* Install cryptography for ACME tests.

* Add constraints.

tests/integration/targets/setup_acme/meta/main.yml

@@ -1,3 +1,4 @@
 dependencies:
 #  - setup_openssl
+  - setup_remote_constraints
   - setup_remote_tmp_dir

tests/integration/targets/setup_acme/tasks/main.yml

@@ -9,6 +9,11 @@
   set_fact:
     openssl_binary: openssl
 
+- name: Make sure cryptography is installed
+  pip:
+    name: cryptography
+    extra_args: "-c {{ remote_constraints }}"
+
 - name: Register openssl version
   shell: "{{ openssl_binary }}  version | cut -d' ' -f2"
   register: openssl_version