docker_container: fix various idempotency problems and non-working options (#45905)

* Sorting args.

* Doing comparisons of options with container parameters in a more context-sensitive way.

This prevents unnecessary restarts, or missing restarts (f.ex. if parameters are removed from ``cmd``).

* Make blkio_weight work.

* Fix cap_drop idempotency problem.

* Making groups idempotent if it contains integers.

* Make cpuset_mems work.

* Make dns_opts work.

* Fixing log_opts: docker expects string values, returns error for integer.

* Adding tests from felixfontein/ansible-docker_container-test#2.

* Make uts work.

* Adding changelog entry.

* Forgot option security_opts.

* Fixing typo.

* Explain strict set(dict) comparison a bit more.

* Improving idempotency tests.

* Making dns_servers a list, since the ordering is relevant.

* Making dns_search_domains a list, since the ordering is relevant.

* Improving dns_search_domains/dns_servers.

* Fixing entrypoint test.

* Making sure options are only supported for correct docker-py versions.

test/integration/targets/docker_container/tasks/main.yml

@@ -1,23 +1,31 @@
 ---
+- name: Create random container name prefix
+  set_fact:
+    cname_prefix: "{{ 'ansible-test-%0x' % ((2**32) | random) }}"
+    cnames: []
+    dnetworks: []
+
+- debug:
+    msg: "Using container name prefix {{ cname_prefix }}"
+
 - block:
-  - name: Create random container name prefix
-    set_fact:
-      cname_prefix: "{{ 'ansible-test-%0x' % ((2**32) | random) }}"
-      cnames: []
+  - include_tasks: run-test.yml
+    with_fileglob:
+    - "tests/*.yml"
 
-  - debug:
-      msg: "Using container name prefix {{ cname_prefix }}"
+  always:
+  - name: "Make sure all containers are removed"
+    docker_container:
+      name: "{{ item }}"
+      state: absent
+      stop_timeout: 1
+    with_items: "{{ cnames }}"
+  - name: "Make sure all networks are removed"
+    docker_network:
+      name: "{{ item }}"
+      state: absent
+      force: yes
+    with_items: "{{ dnetworks }}"
 
-  - block:
-    - include_tasks: run-test.yml
-      with_fileglob:
-      - "tests/*.yml"
-
-    always:
-    - name: "Make sure all containers are removed"
-      docker_container:
-        name: "{{ item }}"
-        state: absent
-        stop_timeout: 1
-      with_items: "{{ cnames }}"
-  when: ansible_os_family != 'RedHat' or ansible_distribution_major_version != '6'
+  # Skip for CentOS 6
+  when: ansible_distribution != 'CentOS' or ansible_distribution_major_version|int > 6