Add in 'unique_servers' into the config file

This was missed previously and should have been there

Github issue #70

Changes

@@ -4,6 +4,7 @@
 - Improve testing on systems that do not have xterm installed
 - Take into account WM decorations when tiling (Github pull request #66) (thanks to Andrew Stevenson)
 - Add option in the config file to hide the menu (Github issue #69)
+- Add 'unique_servers' into the configuration file to match command line option (Github issue #70)
 
 4.07 2016-04-30 Duncan Ferguson <duncan_ferguson@user.sf.net>
 - Fixed tests on systems where bash is not installed in /bin/bash (Github issue #60)

lib/App/ClusterSSH/Config.pm

@@ -99,6 +99,7 @@ my %default_config = (
     menu_send_autotearoff          => 0,
     menu_host_autotearoff          => 0,
 
+    unique_servers    => 0,
     use_all_a_records => 0,
 
     send_menu_xml_file => $ENV{HOME} . '/.clusterssh/send_menu',

t/15config.t

@@ -112,6 +112,7 @@ Readonly::Hash my %default_config => {
     menu_send_autotearoff          => 0,
     menu_host_autotearoff          => 0,
 
+    unique_servers    => 0,
     use_all_a_records => 0,
     use_natural_sort  => 0,
 
@@ -594,6 +595,7 @@ terminal_reserve_right=0
 terminal_reserve_top=5
 terminal_size=80x24
 terminal_title_opt=-T
+unique_servers=0
 unmap_on_redraw=no
 use_all_a_records=0
 use_hotkeys=yes