make the snmplabs test only run when AUTHOR_TESTING is set

xt/10_remote_snmplabs.t

@@ -1,5 +1,12 @@
 #!/usr/bin/env perl
 
+BEGIN {
+  unless ($ENV{AUTHOR_TESTING}) {
+    require Test::More;
+    Test::More::plan(skip_all => 'these tests require online access to be confirmed');
+  }
+}
+
 use strict;
 use warnings;