Allow run docker from non-admin

Allow non-admin use of Docker.ps1

# Fix docker security for VSTS-agents

# get access control list of pipe
$PipeAcl = [System.IO.Directory]::GetAccessControl('\\.\pipe\docker_engine')

# creat new access control identifier
$secident = new-object -Typename System.Security.Principal.SecurityIdentifier('S-1-2-0')

# Create new access control with identifier
$PipeAccessRule = New-Object -TypeName System.Security.AccessControl.FileSystemAccessRule($secident, 'FullControl', 'Allow')

# Add new access control to access control list
$null = $PipeAcl.AddAccessRule($PipeAccessRule)

start-sleep 2
# Set new access control list to pipe
[System.IO.Directory]::SetAccessControl('\\.\pipe\docker_engine', $PipeAcl)