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_log.py

@@ -25,8 +25,8 @@ description:
   - Supports check mode.
   - Analogous to `kubectl logs` or `oc logs`
 extends_documentation_fragment:
-  - community.kubernetes.k8s_auth_options
-  - community.kubernetes.k8s_name_options
+  - kubernetes.core.k8s_auth_options
+  - kubernetes.core.k8s_name_options
 options:
   kind:
     description:
@@ -63,14 +63,14 @@ requirements:
 
 EXAMPLES = r'''
 - name: Get a log from a Pod
-  community.kubernetes.k8s_log:
+  kubernetes.core.k8s_log:
     name: example-1
     namespace: testing
   register: log
 
 # This will get the log from the first Pod found matching the selector
 - name: Log a Pod matching a label selector
-  community.kubernetes.k8s_log:
+  kubernetes.core.k8s_log:
     namespace: testing
     label_selectors:
     - app=example
@@ -78,7 +78,7 @@ EXAMPLES = r'''
 
 # This will get the log from a single Pod managed by this Deployment
 - name: Get a log from a Deployment
-  community.kubernetes.k8s_log:
+  kubernetes.core.k8s_log:
     api_version: apps/v1
     kind: Deployment
     namespace: testing
@@ -87,7 +87,7 @@ EXAMPLES = r'''
 
 # This will get the log from a single Pod managed by this DeploymentConfig
 - name: Get a log from a DeploymentConfig
-  community.kubernetes.k8s_log:
+  kubernetes.core.k8s_log:
     api_version: apps.openshift.io/v1
     kind: DeploymentConfig
     namespace: testing
@@ -111,10 +111,10 @@ log_lines:
 
 import copy
 
-from ansible_collections.community.kubernetes.plugins.module_utils.ansiblemodule import AnsibleModule
+from ansible_collections.kubernetes.core.plugins.module_utils.ansiblemodule import AnsibleModule
 from ansible.module_utils.six import PY2
 
-from ansible_collections.community.kubernetes.plugins.module_utils.args_common import (AUTH_ARG_SPEC, NAME_ARG_SPEC)
+from ansible_collections.kubernetes.core.plugins.module_utils.args_common import (AUTH_ARG_SPEC, NAME_ARG_SPEC)
 
 
 def argspec():
@@ -215,7 +215,7 @@ def serialize_log(response):
 
 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)