[2934] add in-tree path to loadzone so the test can be more self contained.

also introduced Makefile.am in tests/lettuce so setup_interface_bind10.sh
will be auto-regenerated.

configure.ac

@@ -1330,6 +1330,7 @@ AC_CONFIG_FILES([Makefile
                  tests/tools/perfdhcp/Makefile
                  tests/tools/perfdhcp/tests/Makefile
                  tests/tools/perfdhcp/tests/testdata/Makefile
+                 tests/lettuce/Makefile
                  m4macros/Makefile
                  dns++.pc
                ])

tests/Makefile.am

@@ -1 +1 @@
-SUBDIRS = tools
+SUBDIRS = tools lettuce

tests/lettuce/Makefile.am

@@ -0,0 +1 @@
+noinst_SCRIPTS = setup_intree_bind10.sh