Exclude the TimeZone/Computer/FileCatalog cmdlets for Linux. They use windows specific Win32 APIs

test/powershell/Modules/Microsoft.PowerShell.Management/Get-TimeZone.Tests.ps1

@@ -14,6 +14,8 @@
            [snippet] Both StandardName and DaylightName are localized according to the current user default UI language.
 #>
 
+if ($IsWindows) {
+
 function Assert-ListsSame
 {
     param([object[]] $expected, [object[]] $observed )
@@ -116,3 +118,4 @@ Describe "Get-Timezone test cases" -tags 'Innerloop','RI' {
     }
 }
 
+}

test/powershell/Modules/Microsoft.PowerShell.Management/Set-TimeZone.Tests.ps1

@@ -14,6 +14,8 @@
            [snippet] Both StandardName and DaylightName are localized according to the current user default UI language.
 #>
 
+if ($IsWindows) {
+
 function Assert-ListsSame
 {
     param([object[]] $expected, [object[]] $observed )
@@ -131,3 +133,5 @@ Describe "Set-Timezone test cases" -tags 'Innerloop','RI' {
         $observed.Id -eq $origTimeZoneID | Should Be $true
     }
 }
+
+}

test/powershell/Modules/Microsoft.PowerShell.Security/FileCatalog.Tests.ps1

@@ -3,6 +3,8 @@
 # Copyright (c) Microsoft Corporation, 2016
 #
 
+if ($IsWindows) {
+
 $script:catalogPath = "" 
  
 Describe "Test suite for NewFileCatalogAndTestFileCatalogCmdlets" -Tags "Innerloop","BVT" {
@@ -375,3 +377,5 @@ Describe "Test suite for NewFileCatalogAndTestFileCatalogCmdlets" -Tags "Innerlo
         }
     }
 }
+
+}