removed Enable-HyperV from provisioning steps

because HyperV being enabled prevents NSXT team from being able to use
resulting stemcells

[#173045518](https://www.pivotaltracker.com/story/show/173045518)
 As a platform operator I should be able to use Windows stemcells with Hyper-V disabled

Author: fg-j

stemcell-automation/AutomationHelpers.Tests.ps1

@@ -125,43 +125,6 @@ Describe "InstallCFFeatures" {
     }
 }
 
-Describe "Enable-HyperV" {
-    It "executes the Enable-Hyper-V powershell cmdlet when the os version is 2019" {
-        Mock Enable-Hyper-V { }
-        Mock Write-Log { }
-        $osVersion2019 = "10.0.17763.2761"
-        Mock Get-OSVersionString { $osVersion2019 }
-
-        { Enable-HyperV } | Should -Not -Throw
-
-        Assert-MockCalled Enable-Hyper-V -Times 1 -Scope It
-        Assert-MockCalled Write-Log -Times 1 -Scope It -ParameterFilter { $Message -eq "Successfully enabled HyperV" }
-    }
-
-    It "does not execute the Enable-Hyper-V powershell cmdlet when the os version is not 2019" {
-        Mock Enable-Hyper-V { }
-        Mock Write-Log { }
-        $osVersion1803 = "10.0.17134.2761"
-        Mock Get-OSVersionString { $osVersion1803 }
-
-        { Enable-HyperV } | Should -Not -Throw
-
-        Assert-MockCalled Enable-Hyper-V -Times 0 -Scope It
-        Assert-MockCalled Write-Log -Times 1 -Scope It -ParameterFilter { $Message -eq "Did not enable HyperV because OS Version is not 2019" }
-    }
-
-    It "fails gracefully when enabling Hyper-V" {
-        Mock Enable-Hyper-V { throw "unable to comply" }
-        Mock Write-Log { }
-        $osVersion2019 = "10.0.17763.2761"
-        Mock Get-OSVersionString { $osVersion2019 }
-
-        { Enable-HyperV } | Should -Throw "unable to comply"
-
-        Assert-MockCalled Write-Log -Times 1 -Scope It -ParameterFilter { $Message -eq "unable to comply" }
-        Assert-MockCalled Write-Log -Times 1 -Scope It -ParameterFilter { $Message -eq "Failed to enable HyperV. See 'c:\provision\log.log' for more info." }
-    }
-}
 
 Describe "InstallCFCell" {
     It "executes the Protect-CFCell powershell cmdlet" {

stemcell-automation/AutomationHelpers.ps1

@@ -71,28 +71,6 @@ function InstallCFFeatures
     }
 }
 
-function Enable-HyperV
-{
-    try
-    {
-        $osVersion2019Regex = "10\.0\.17763\..+"
-        $osVersion = Get-OSVersionString
-        if ($osVersion -match $osVersion2019Regex) {
-            Enable-Hyper-V
-            Write-Log "Successfully enabled HyperV"
-        }
-        else {
-            Write-Log "Did not enable HyperV because OS Version is not 2019"
-        }
-
-    }
-    catch [Exception]
-    {
-        Write-Log $_.Exception.Message
-        Write-Log "Failed to enable HyperV. See 'c:\provision\log.log' for more info."
-        throw $_.Exception
-    }
-}
 
 function InstallCFCell
 {

stemcell-automation/ProvisionVM.Tests.ps1

@@ -12,7 +12,6 @@ Describe "ProvisionVM" {
         Mock Enable-SSHD { $provisionerCalls.Add("Enable-SSHD") }
         Mock Install-SecurityPoliciesAndRegistries { $provisionerCalls.Add("Install-SecurityPoliciesAndRegistries") }
         Mock Extract-LGPO { $provisionerCalls.Add("Extract-LGPO") }
-        Mock Enable-HyperV { $provisionerCalls.Add("Enable-HyperV") }
         Mock Install-WUCerts { $provisionerCalls.Add("Install-WUCerts") }
         Mock Create-VersionFile { $provisionerCalls.Add("Create-VersionFile") }
 
@@ -36,11 +35,6 @@ Describe "ProvisionVM" {
 
         Assert-MockCalled -CommandName InstallCFFeatures
     }
-    It "enables Hyper-V when possible" {
-        ProvisionVM
-
-        Assert-MockCalled -CommandName Enable-HyperV
-    }
 
     It "copy PSModules is the first provisioner called" {
         ProvisionVM

stemcell-automation/ProvisionVM.ps1

@@ -13,7 +13,7 @@ function ProvisionVM() {
     Install-SecurityPoliciesAndRegistries
     Enable-SSHD
     InstallCFFeatures
-    Enable-HyperV
+
     try
     {
         Install-WUCerts