Remove .Net check

cmd_exec doesn't seem to be the best way to go because there is
some issue grabbing the output sometimes.

Author: wchen-r7

lib/msf/core/post/windows/powershell.rb

@@ -30,43 +30,6 @@ def have_powershell?
     return false
   end
 
-  #
-  # Returns the .Net version
-  #
-  def get_dotnet_version
-    case sysinfo['OS']
-    when /Windows 8|10/
-      cmd = 'wmic /namespace:\\\\root\\cimv2 path win32_optionalfeature where "caption like \'.NET Framework%\' and InstallState = 1" get caption'
-    else
-      cmd = 'wmic /namespace:\\\\root\\cimv2 path win32_product where "name like \'%%.NET%%\'" get version'
-    end
-
-    if have_powershell?
-      process, pid, c = execute_script(cmd)
-      cmd_out = ''
-      while (d = process.channel.read)
-        if d == ""
-          if (Time.now.to_i - start < time_out) && (cmd_out == '')
-            sleep 0.1
-          else
-            break
-          end
-        else
-          cmd_out << d
-        end
-      end
-    else
-      begin
-        cmd_out = cmd_exec(cmd)
-      rescue Rex::TimeoutError
-        return nil
-      end
-    end
-
-    cmd_out.scan(/(\d\.[\d\.]+)/).flatten.first
-  end
-
-
   #
   # Returns the Powershell version
   #