Fix perl use of 'use lib'

The 'use lib' logic happens in the pre-compile stage, so one cannot
use normal 'if' logic to use a particular INC.  Instead, just make sure
that best dir is added to 'use lib' last since it prepends to INC.

json/test_sta_mode.pl

@@ -17,6 +17,8 @@ use LWP::UserAgent;
 use Data::Dumper;
 use JSON;
 use lib '/home/lanforge/scripts';
+use lib "../";
+use lib "./";
 use LANforge::JsonUtils qw(err logg xpand json_request);
 
 
@@ -57,4 +59,4 @@ for my $rh_e (@{$rh->{interfaces}}) {
    sleep 0.1;
 }
 
-#
+#