Fix foreach issue and update some schema examples

[luhan2017]

Fixes #3680 and #3700

[luhan2017]

@vishwacsena, I did want to add ForeachPage, but I found that the Nested ForeachPage is not working as expected. Here is a test case I created:

@@ -0,0 +1,138 @@
{
    "$schema": "../../../../schemas/sdk.schema",
  "$kind": "Microsoft.Test.Script",
  "dialog": {
    "$kind": "Microsoft.AdaptiveDialog",
    "id": "root",
    "triggers": [
      {
        "$kind": "Microsoft.OnBeginDialog",
        "actions": [
          {
            "$kind": "Microsoft.SetProperty",
            "property": "dialog.todo",
            "value": "=[]"
          },
          {
            "$kind": "Microsoft.EditArray",
            "itemsProperty": "dialog.todo",
            "changeType": "push",
            "value": "=1"
          },
          {
            "$kind": "Microsoft.EditArray",
            "itemsProperty": "dialog.todo",
            "changeType": "push",
            "value": "=2"
          },
          {
            "$kind": "Microsoft.EditArray",
            "itemsProperty": "dialog.todo",
            "changeType": "push",
            "value": "=3"
          },
          {
            "$kind": "Microsoft.EditArray",
            "itemsProperty": "dialog.todo",
            "changeType": "push",
            "value": "=4"
          },
          {
            "$kind": "Microsoft.EditArray",
            "itemsProperty": "dialog.todo",
            "changeType": "push",
            "value": "=5"
          },
          {
            "$kind": "Microsoft.EditArray",
            "itemsProperty": "dialog.todo",
            "changeType": "push",
            "value": "=6"
          },
          {
            "$kind": "Microsoft.ForeachPage",
            "itemsProperty": "dialog.todo",
            "pageSize": 4,
            "pageIndex": "dialog.foreachpage.outerIndex",
            "pageValue": "dialog.foreachpage.outerValue",
            "actions": [
              {
                "$kind": "Microsoft.ForeachPage",
                "itemsProperty": "dialog.foreachpage.outerValue",
                "pageSize": 2,
                "actions": [
                  {
                    "$kind": "Microsoft.SendActivity",
                    "activity": "This page have ${count(dialog.foreach.page)} items"
                  },
                  {
                    "$kind": "Microsoft.Foreach",
                    "itemsProperty": "dialog.foreach.page",
                    "actions": [
                      {
                        "$kind": "Microsoft.SendActivity",
                        "activity": "index is: ${dialog.foreach.index} and value is: ${dialog.foreach.value}"
                      }
                    ]
                  }
                ]
              }
            ]
          },
          {
              "$kind":"Microsoft.SendActivity",
              "activity":"done"
          }
        ]
      }
    ],
    "autoEndDialog": true,
    "defaultResultProperty": "dialog.result"
  },
  "script": [
    {
      "$kind": "Microsoft.Test.UserSays",
      "text": "hi"
    },
    {
      "$kind": "Microsoft.Test.AssertReply",
      "text": "This page have 2 items"
    },
    {
      "$kind": "Microsoft.Test.AssertReply",
      "text": "index is: 0 and value is: 1"
    },
    {
      "$kind": "Microsoft.Test.AssertReply",
      "text": "index is: 1 and value is: 2"
    },
    {
      "$kind": "Microsoft.Test.AssertReply",
      "text": "This page have 2 items"
    },
    {
      "$kind": "Microsoft.Test.AssertReply",
      "text": "index is: 0 and value is: 3"
    },
    {
      "$kind": "Microsoft.Test.AssertReply",
      "text": "index is: 1 and value is: 4"
    },
    {
      "$kind": "Microsoft.Test.AssertReply",
      "text": "This page have 2 items"
    },
    {
      "$kind": "Microsoft.Test.AssertReply",
      "text": "index is: 0 and value is: 5"
    },
    {
      "$kind": "Microsoft.Test.AssertReply",
      "text": "index is: 1 and value is: 6"
    },
    {
      "$kind": "Microsoft.Test.AssertReply",
      "text": "done"
    }
  ]
}

But in fact, it didn't run the second iteration of the outer ForeachPage. the actually result missed the three steps.

    {
      "$kind": "Microsoft.Test.AssertReply",
      "text": "This page have 2 items"
    },
    {
      "$kind": "Microsoft.Test.AssertReply",
      "text": "index is: 0 and value is: 5"
    },
    {
      "$kind": "Microsoft.Test.AssertReply",
      "text": "index is: 1 and value is: 6"
    },

@tomlm and @Stevenic any idea why this happening?

[tomlm]

[vishwacsena]

@luhan2017 were you able to get past the issues with ForEachPage?

[luhan2017]

@vishwacsena , I have figured out why the foreachPage nested not working. it can be resolved by resetting the PageIndex in the BeginDialog. I've update the ForeachPage with schema and test cases.