Restructure of pester test layout

This restructuring moves tests to a directory name which matches the module
in which the cmdlet resides which should improve the discoverability of a
specific test.
For tests which are not about cmdlets in a module, new directories have been
created to make those tests easier to find as well

test/powershell/Modules/Microsoft.PowerShell.Utility/Write-Host.Tests.ps1

@@ -0,0 +1,22 @@
+Describe "Write-Host DRT Unit Tests" -Tags DRT{ 
+    $testData = @(
+        @{ Name = 'NoNewline';Command = "Write-Host a,b -Separator ',' -ForegroundColor Yellow -BackgroundColor DarkBlue -NoNewline"; returnValue = "a,b" }
+        @{ Name = 'Separator';Command = "Write-Host a,b,c -Separator '+'"; returnValue = "a+b+c" }
+    )
+   
+    It "write-Host works with '<Name>' switch" -TestCases $testData -Pending:$IsOSX { 
+        param($Command, $returnValue) 
+
+        If($IsLinux)
+        {
+            $content = powershell  -noprofile -command $Command
+        }
+        
+        If ($IsWindows)
+        {
+            $content = powershell.exe -noprofile -command $Command
+        }
+
+        $content | Should Be $returnValue
+    }
+}