fixes for memory_cached test

t/unittest/pfconfig/memory_cached.t

@@ -15,6 +15,7 @@ use strict;
 use warnings;
 BEGIN {
     use lib qw(/usr/local/pf/t /usr/local/pf/lib);
+    use test_paths;
     use setup_test_config;
 }
 
@@ -27,11 +28,13 @@ use_ok("pfconfig::manager");
 
 my $testkey = "testkey";
 my $testns = "testns";
+my $testns2 = "testns2";
 
 my $mem = pfconfig::memory_cached->new($testns);
 
 my $manager = pfconfig::manager->new();
 $manager->touch_cache($testns);
+$manager->touch_cache($testns2);
 
 my $result;
 
@@ -49,7 +52,6 @@ $result = $mem->compute_from_subcache($testkey, sub {"value changed !"});
 is($result, "value changed !", 
     "Value is properly recompute_from_subcached when namespace expired.");
 
-my $testns2 = "testns2";
 $mem = pfconfig::memory_cached->new($testns, $testns2);
 
 $result = $mem->compute_from_subcache($testkey, sub {"dinde"});