Rename from community.kubernetes to kubernetes.core (#6)

* Rename from community.kubernetes to kubernetes.core

This goes through and renames community.kubernetes to kubernetes.core.
Most of this was generated from the downstream build script that was
used on the community repository, plus whatever hand edits I could find
that were needed.

The downstream build and test process has also been removed as this
repository is now the downstream repository.

* Fix CONTRIBUTING.md

plugins/modules/k8s_service.py

@@ -21,9 +21,9 @@ description:
   - Use Openshift Python SDK to manage Services on Kubernetes
 
 extends_documentation_fragment:
-  - community.kubernetes.k8s_auth_options
-  - community.kubernetes.k8s_resource_options
-  - community.kubernetes.k8s_state_options
+  - kubernetes.core.k8s_auth_options
+  - kubernetes.core.k8s_resource_options
+  - kubernetes.core.k8s_state_options
 
 options:
   merge_type:
@@ -91,7 +91,7 @@ requirements:
 
 EXAMPLES = r'''
 - name: Expose https port with ClusterIP
-  community.kubernetes.k8s_service:
+  kubernetes.core.k8s_service:
     state: present
     name: test-https
     namespace: default
@@ -102,7 +102,7 @@ EXAMPLES = r'''
       key: special
 
 - name: Expose https port with ClusterIP using spec
-  community.kubernetes.k8s_service:
+  kubernetes.core.k8s_service:
     state: present
     name: test-https
     namespace: default
@@ -148,8 +148,8 @@ import copy
 
 from collections import defaultdict
 
-from ansible_collections.community.kubernetes.plugins.module_utils.ansiblemodule import AnsibleModule
-from ansible_collections.community.kubernetes.plugins.module_utils.args_common import (
+from ansible_collections.kubernetes.core.plugins.module_utils.ansiblemodule import AnsibleModule
+from ansible_collections.kubernetes.core.plugins.module_utils.args_common import (
     AUTH_ARG_SPEC, COMMON_ARG_SPEC, RESOURCE_ARG_SPEC)
 
 SERVICE_ARG_SPEC = {
@@ -228,7 +228,7 @@ def execute_module(module, k8s_ansible_mixin):
 
 def main():
     module = AnsibleModule(argument_spec=argspec(), supports_check_mode=True)
-    from ansible_collections.community.kubernetes.plugins.module_utils.common import (
+    from ansible_collections.kubernetes.core.plugins.module_utils.common import (
         K8sAnsibleMixin, get_api_client)
 
     k8s_ansible_mixin = K8sAnsibleMixin(module)