Add domain check V-63319

[njohnson11]

Control V-63319 mentions that the control is only applicable to domain-joined systems, however the test does not check for the system domain.

The fix could be implemented like this:

    domain = command('wmic computersystem get domain | FINDSTR /V Domain').stdout.strip
    if domain == 'WORKGROUP'
      impact 0.0
      describe 'This system is not joined to a domain, therefore this control is Not Applicable' do
        skip 'This system is not joined to a domain, therefore this control is Not Applicable'
      end
    else
      describe os.arch do
        it { should eq 'x86_64' }
      end
      describe os.name do
        it { should eq 'windows_10_enterprise' }
      end
    end

Or like this:

    is_domain = command("(gwmi win32_computersystem).partofdomain").stdout.strip == "True"
    if is_domain
      describe os.arch do
        it { should eq 'x86_64' }
      end
      describe os.name do
        it { should eq 'windows_10_enterprise' }
      end
    else
      impact 0.0
        describe 'This system is not joined to a domain, therefore this control is Not Applicable' do
          skip 'This system is not joined to a domain, therefore this control is Not Applicable'
        end
      else
    end