Fixes so that make distcheck passes.

- Include the Varnish default vmod_path in the varnishtest command.
- Non-generated VTCs are also distrubuted.
- Clean the .dummy file.

src/Makefile.am

@@ -90,7 +90,7 @@ TEST_EXTENSIONS = .vtc
 VTC_LOG_COMPILER = varnishtest -v
 AM_VTC_LOG_FLAGS = \
 	-p vcl_path="$(abs_top_srcdir)/vcl" \
-	-p vmod_path="$(abs_builddir)/.libs:$(vmoddir)"
+	-p vmod_path="$(abs_builddir)/.libs:$(vmoddir):$(VARNISHAPI_VMODDIR)"
 
 # Documentation
 
@@ -109,7 +109,10 @@ dist_man_MANS = \
 	$(AM_V_GEN) $(RST2MAN) $< $@
 
 EXTRA_DIST = \
-	tbl_vtc.h
+	tbl_vtc.h \
+	${TESTS}
+
+CLEANFILES = vtc/.dummy
 
 MAINTAINERCLEANFILES = \
 	$(GEN_TESTS) \