Ensure play order is obeyed (#49897)

* Ensure play order is obeyed

 it was being ignored depending on other options
 also added tests for each order (except shuffle) both serial and not
 fixes #49846

test/integration/targets/order/aliases

@@ -0,0 +1,3 @@
+shippable/posix/group1
+shippable/posix/group2
+shippable/posix/group3

test/integration/targets/order/inventory

@@ -0,0 +1,9 @@
+[incremental]
+hostB
+hostA
+hostD
+hostC
+
+[incremental:vars]
+ansible_connection=local
+ansible_python_interpreter='{{ansible_playbook_python}}'

test/integration/targets/order/order.yml

@@ -0,0 +1,27 @@
+- name: just plain order
+  hosts: all
+  gather_facts: false
+  order: '{{ myorder|default("inventory")}}'
+  tasks:
+    - shell: echo '{{inventory_hostname}}' >> hostlist.txt
+
+- name: with serial
+  hosts: all
+  gather_facts: false
+  serial: 1
+  order: '{{ myorder|default("inventory")}}'
+  tasks:
+    - shell: echo '{{inventory_hostname}}' >> shostlist.txt
+
+- name: ensure everything works
+  hosts: localhost
+  gather_facts:  false
+  tasks:
+    - assert:
+        that:
+          - item.1 == hostlist[item.0]
+          - item.1 == shostlist[item.0]
+      loop: '{{ lookup("indexed_items", inputlist) }}'
+      vars:
+        hostlist: '{{lookup("file", "hostlist.txt").splitlines()}}'
+        shostlist: '{{lookup("file", "shostlist.txt").splitlines()}}'

test/integration/targets/order/runme.sh

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+#!/usr/bin/env bash
+
+set -eux
+
+for EXTRA in '{"inputlist": ["hostB", "hostA", "hostD", "hostC"]}' \
+             '{"myorder": "inventory", "inputlist": ["hostB", "hostA", "hostD", "hostC"]}' \
+             '{"myorder": "sorted", "inputlist": ["hostA", "hostB", "hostC", "hostD"]}'  \
+		     '{"myorder": "reverse_sorted", "inputlist": ["hostD", "hostC", "hostB", "hostA"]}' \
+             '{"myorder": "reverse_inventory", "inputlist": ["hostC", "hostD", "hostA", "hostB"]}'
+do
+	rm shostlist.txt hostlist.txt || true
+	ansible-playbook order.yml --forks 1 -i inventory -e "$EXTRA" "$@"
+done