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/Default-Aliases.Tests.ps1

@@ -0,0 +1,19 @@
+$removeAliasList = @("ac","compare","cpp","diff","sleep","sort","start","cat","cp","ls","man","mount","mv","ps","rm","rmdir")
+$keepAliasList = @{cd="Set-Location"},@{dir="Get-ChildItem"},@{echo="Write-output"},@{fc="format-custom"},@{kill="stop-process"},@{clear="clear-host"}
+Describe "Windows aliases do not conflict with Linux commands" {
+    foreach ($alias in $removeAliasList) {
+        It "Should not have certain aliases on Linux" -Skip:$IsWindows {
+            Test-Path Alias:$alias | Should Be $false
+        }
+    }
+
+    foreach ($alias in $keepAliasList) {
+        It "Should have aliases that are Bash built-ins on Linux" {
+            (Get-Alias $alias.Keys).Definition | Should Be $alias.Values
+        }
+    }
+
+    It "Should have more as a function" {
+        Test-Path Function:more | Should Be $true
+    }
+}