changes tags for tests

Start using tags CI, Feature, Scenario

test/powershell/Language/Classes/Scripting.Classes.Break.Tests.ps1

@@ -1,4 +1,4 @@
-Describe 'Break statements with classes' -Tags "DRT" {
+Describe 'Break statements with classes' -Tags "CI" {
     
     function Get-Errors([string]$sourceCode) {
         $tokens = $null 

test/powershell/Language/Classes/Scripting.Classes.Exceptions.Tests.ps1

@@ -224,7 +224,7 @@ $canaryHashtable['canary'] += 100
     }
 }
 
-Describe "Exception error position" -Tags "DRT" {
+Describe "Exception error position" -Tags "CI" {
     class MSFT_3090412
     {
         static f1() { [MSFT_3090412]::bar = 42 }

test/powershell/Language/Classes/Scripting.Classes.MiscOps.Tests.ps1

@@ -1,4 +1,4 @@
-Describe 'Misc Test' -Tags "innerloop", "DRT" {
+Describe 'Misc Test' -Tags "CI" {
     
     Context 'Where' {
         class C1 {    
@@ -43,4 +43,4 @@ Describe 'Misc Test' -Tags "innerloop", "DRT" {
                 [C1]::new().Bar() | should be "1;2;3;"
         }
     }
-}
+}

test/powershell/Language/Classes/Scripting.Classes.Modules.Tests.ps1

@@ -1,11 +1,11 @@
-Describe 'PSModuleInfo.GetExportedTypeDefinitions()' {
+Describe 'PSModuleInfo.GetExportedTypeDefinitions()' -Tags "CI" {
     It "doesn't throw for any module" {
         $discard = Get-Module -ListAvailable | % { $_.GetExportedTypeDefinitions() }
         $true | Should Be $true # we only verify that we didn't throw. This line contains a dummy Should to make pester happy.
     }
 }
 
-Describe 'use of a module from two runspaces' {
+Describe 'use of a module from two runspaces' -Tags "CI" {
     function New-TestModule {
         param(
             [string]$Name, 

test/powershell/Language/Classes/scripting.Classes.NestedModules.tests.ps1

@@ -1,4 +1,4 @@
-Describe 'NestedModules' -Tags "DRT" {
+Describe 'NestedModules' -Tags "CI" {
     
     Import-Module $PSScriptRoot\..\LanguageTestSupport.psm1
 

test/powershell/Language/Classes/scripting.Classes.inheritance.tests.ps1

@@ -4,7 +4,7 @@
 
 Import-Module $PSScriptRoot\..\LanguageTestSupport.psm1
 
-Describe 'Classes inheritance syntax' -Tags "DRT" {
+Describe 'Classes inheritance syntax' -Tags "CI" {
 
     It 'Base types' {
         class C1 {}

test/powershell/Language/Classes/scripting.enums.tests.ps1

@@ -2,7 +2,7 @@
 # Copyright (c) Microsoft Corporation, 2015
 #
 
-Describe 'enums' -Tags "DRT" {
+Describe 'enums' -Tags "CI" {
 
     Context 'basic enums' {
         enum E1