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_rollback.py

@@ -28,8 +28,8 @@ options:
     type: list
     elements: str
 extends_documentation_fragment:
-  - community.kubernetes.k8s_auth_options
-  - community.kubernetes.k8s_name_options
+  - kubernetes.core.k8s_auth_options
+  - kubernetes.core.k8s_name_options
 requirements:
   - "python >= 2.7"
   - "openshift >= 0.6"
@@ -38,7 +38,7 @@ requirements:
 
 EXAMPLES = r'''
 - name: Rollback a failed deployment
-  community.kubernetes.k8s_rollback:
+  kubernetes.core.k8s_rollback:
     api_version: apps/v1
     kind: Deployment
     name: web
@@ -78,8 +78,8 @@ rollback_info:
 
 import copy
 
-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, NAME_ARG_SPEC)
 
 
@@ -208,7 +208,7 @@ def get_previous_revision(all_resources, current_revision):
 
 def main():
     module = AnsibleModule(argument_spec=argspec(), supports_check_mode=True)
-    from ansible_collections.community.kubernetes.plugins.module_utils.common import (K8sAnsibleMixin, get_api_client)
+    from ansible_collections.kubernetes.core.plugins.module_utils.common import (K8sAnsibleMixin, get_api_client)
 
     k8s_ansible_mixin = K8sAnsibleMixin(module)
     k8s_ansible_mixin.client = get_api_client(module=module)