k8s_exec: add argument to support pod with multiple containers

lib/ansible/modules/clustering/k8s/k8s_exec.py

@@ -54,6 +54,11 @@
     - The pod name
     type: str
     required: yes
+  container:
+    description:
+    - The name of the container in the pod to connect to. Defaults to only container if there is only one container in the pod.
+    type: str
+    required: no
   command:
     description:
     - The command to execute
@@ -109,6 +114,7 @@ def argspec(self):
         spec = copy.deepcopy(AUTH_ARG_SPEC)
         spec['namespace'] = {'type': 'str'}
         spec['pod'] = {'type': 'str'}
+        spec['container'] = {'type': 'str'}
         spec['command'] = {'type': 'str'}
         return spec
 
@@ -122,6 +128,7 @@ def main():
         api.connect_get_namespaced_pod_exec,
         module.params["pod"],
         module.params["namespace"],
+        container=module.params.get("container"),
         command=shlex.split(module.params["command"]),
         stdout=True,
         stderr=True,