default collection support (#61415)

* default collection support

* playbooks run from inside a registered collection will set that collection as the first item in the search order (as will all non-collection roles)
* this allows easy migration of runme.sh style playbook/role integration tests to collections without the playbooks/roles needing to know the name of their enclosing collection

* ignore bogus sanity error

* filed #61460

* fixed task unit test failure

* don't append an empty collections list to the ds

* ignore leftover local_action in mod_args ds action parsing

* fix async_extra_data test to not require ssh and bogus locale

* disable default collection test under Windows

* ensure collection location FS code is always bytes

* add changelog

test/integration/targets/async_extra_data/aliases

@@ -1,4 +1 @@
-needs/ssh
 shippable/posix/group3
-skip/freebsd
-skip/osx

test/integration/targets/async_extra_data/inventory

@@ -1 +0,0 @@
-localhost ansible_connection=ssh ansible_python_interpreter="{{ ansible_playbook_python }}"

test/integration/targets/async_extra_data/library/junkping.py

@@ -0,0 +1,15 @@
+#!/usr/bin/python
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+import json
+
+
+def main():
+    print("junk_before_module_output")
+    print(json.dumps(dict(changed=False, source='user')))
+    print("junk_after_module_output")
+
+
+if __name__ == '__main__':
+    main()

test/integration/targets/async_extra_data/runme.sh

@@ -2,8 +2,6 @@
 
 set -eux
 
-# Verify that extra data before module JSON output during async call is ignored.
-ANSIBLE_DEBUG=0 LC_ALL=bogus ansible-playbook test_async.yml -i inventory -v "$@"
-# Verify that the warning exists by examining debug output.
-ANSIBLE_DEBUG=1 LC_ALL=bogus ansible-playbook test_async.yml -i inventory -v "$@" \
-    | grep 'bash: warning: setlocale: LC_ALL: cannot change locale (bogus)' > /dev/null
+# Verify that extra data before module JSON output during async call is ignored, and that the warning exists.
+ANSIBLE_DEBUG=0 ansible-playbook -i ../../inventory test_async.yml -v "$@" \
+    | grep 'junk after the JSON data: junk_after_module_output'

test/integration/targets/async_extra_data/test_async.yml

@@ -1,9 +1,9 @@
-- hosts: localhost
+- hosts: testhost
   gather_facts: false
   tasks:
   # make sure non-JSON data before module output is ignored
-  - name: async ping with invalid locale via ssh
-    ping:
+  - name: async ping wrapped in extra junk
+    junkping:
     async: 10
     poll: 1
     register: result