<!--- Verify first that your issue is not already reported on GitHub -->
<!--- Also test if the latest release and devel branch are affected too -->
<!--- Complete *all* sections as described, this form is processed automatically -->

##### SUMMARY
docker_container is not idempotent when specifying an ip address

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
docker_container

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
ansible 2.8.5
  config file = /home/pkueck/projects/cix.de/cix-ansible/ansible.cfg
  configured module search path = ['/home/xxx/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /usr/lib/python3.7/site-packages/ansible
  executable location = /usr/bin/ansible
  python version = 3.7.4 (default, Jul  9 2019, 16:32:37) [GCC 9.1.1 20190503 (Red Hat 9.1.1-1)]
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```paste below
n/a
```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->
Fedora 30, CentOS 7

##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->

<!--- Paste example playbooks or commands between quotes below -->
```yaml
---
- hosts: myhost
  gather_facts: no
  tasks:
    - docker_network:
        name: "foonet"
        ipam_config:
          - subnet: 172.16.44.0/24
    - docker_container:
        name: "foo"
        state: present
        image: centos
        networks:
          - name: foonet
            ipv4_address: "172.16.44.11"
        networks_cli_compatible: yes
      loop: [1,2]
```

<!--- HINT: You can paste gist.github.com links for larger files -->

##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
container created on first loop cycle, not touched on second one

##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->

<!--- Paste verbatim command output between quotes -->
```paste below
PLAY [myhost] ***************

TASK [docker_network] *******
ok: [myhost]

TASK [docker_container] *****
--- before
+++ after
@@ -1,9 +1,10 @@
 {
-    "exists": false,
+    "exists": true,
     "network.foonet": {
         "aliases": null,
-        "ipv4_address": "",
-        "ipv6_address": "",
+        "id": "27e539c3b9af0160f02a0532ad081d1bd1ef3dd93e652095ec96d6dfd95bf2fb",
+        "ipv4_address": "172.16.44.11",
+        "ipv6_address": null,
         "links": null,
         "name": "foonet"
     }

changed: [myhost] => (item=1)
--- before
+++ after
@@ -1,10 +1,9 @@
 {
     "network.foonet": {
-        "aliases": [
-            "44cfded131d7"
-        ],
-        "ipv4_address": "",
-        "ipv6_address": "",
+        "aliases": null,
+        "id": "27e539c3b9af0160f02a0532ad081d1bd1ef3dd93e652095ec96d6dfd95bf2fb",
+        "ipv4_address": "172.16.44.11",
+        "ipv6_address": null,
         "links": null,
         "name": "foonet"
     }

changed: [myhost] => (item=2)
```

image:
    description:
      - Repository path and tag used to create the container. If an image is not found or pull is true, the image
        will be pulled from the registry. If no tag is included, C(latest) will be used.
      - Can also be an image ID. If this is the case, the image is assumed to be available locally.
        The C(pull) option is ignored for this case.
    type: str
  init:
    description:
      - Run an init inside the container that forwards signals and reaps processes.
        This option requires Docker API >= 1.25.
    type: bool
    default: no
    version_added: "2.6"
  interactive:
    description:
      - Keep stdin open after a container is launched, even if not attached.
    type: bool
    default: no
  ipc_mode:
    description:
      - Set the IPC mode for the container. Can be one of 'container:<name|id>' to reuse another
        container's IPC namespace or 'host' to use the host's IPC namespace within the container.
    type: str
  keep_volumes:
    description:
      - Retain volumes associated with a removed container.
    type: bool
    default: yes
  kill_signal: