setup - remvoe dep on shared function (#752)

Remove the dep on ConvertFrom-AnsibleJson so that we can start to
deprecate that function in Ansible exec wrapper. This is the only
instance where it is used outside of the exec wrapper and it can easily
be replaced by the custom PSCustomObject enumerator. Luckily this code
path is not used by any of our supported connection plugins. It may be
used by other connection types that cannot pipeline or through local
debugging.

changelogs/fragments/setup-json.yml

@@ -0,0 +1,2 @@
+minor_changes:
+  - setup - Remove dependency on shared function loaded by Ansible

galaxy.yml

@@ -1,6 +1,6 @@
 namespace: ansible
 name: windows
-version: 2.7.0
+version: 2.8.0
 readme: README.md
 authors:
   - Jordan Borean @jborean93

plugins/modules/setup.ps1

@@ -25,20 +25,29 @@ $spec = @{
 # This module can be called by the gather_facts action plugin in ansible-base. While it shouldn't add any new options
 # we need to make sure the module doesn't break if it does. To do this we need to add any options in the input args
 if ($args.Length -gt 0) {
-    $params = Get-Content -LiteralPath $args[0] | ConvertFrom-AnsibleJson
+    $params = Get-Content $args[0] | ConvertFrom-Json
+    if ($params) {
+        foreach ($prop in $params.PSObject.Properties.Name) {
+            if ($prop.StartsWith('_') -or $spec.options.ContainsKey($prop)) {
+                continue
+            }
+            $spec.options.$prop = @{ type = 'raw' }
+        }
+    }
 }
 else {
     $params = $complex_args
-}
-if ($params) {
-    foreach ($param in $params.GetEnumerator()) {
-        if ($param.Key.StartsWith('_') -or $spec.options.ContainsKey($param.Key)) {
-            continue
+    if ($params) {
+        foreach ($param in $params.GetEnumerator()) {
+            if ($param.Key.StartsWith('_') -or $spec.options.ContainsKey($param.Key)) {
+                continue
+            }
+            $spec.options."$($param.Key)" = @{ type = 'raw' }
         }
-        $spec.options."$($param.Key)" = @{ type = 'raw' }
     }
 }
 
+
 $module = [Ansible.Basic.AnsibleModule]::Create($args, $spec)
 
 $measureSubset = $module.Params._measure_subset