build: distcheck: add missing bits for testsuite distcheck

Got some errors during 'make distcheck', copying the way openbsc.git does these
things.

Change-Id: I13d76cd56dfb8fe4eb02d6fcada78a9e3311b51b
diff --git a/src/tests/Makefile.am b/src/tests/Makefile.am
index d36c018..2ba3e89 100644
--- a/src/tests/Makefile.am
+++ b/src/tests/Makefile.am
@@ -41,12 +41,22 @@
              } >'$(srcdir)/package.m4'
 
 TESTSUITE = $(srcdir)/testsuite
+EXTRA_DIST = testsuite.at $(TESTSUITE) $(srcdir)/package.m4 \
+	     test-helpers.err  test-helpers.ok  test-hnbap.ok  test-ranap.ok
 
 DISTCLEANFILES = atconfig
 
 check-local: atconfig $(TESTSUITE)
 	$(SHELL) '$(TESTSUITE)' $(TESTSUITEFLAGS)
 
+installcheck-local: atconfig $(TESTSUITE)
+	$(SHELL) '$(TESTSUITE)' AUTOTEST_PATH='$(bindir)' \
+		$(TESTSUITEFLAGS)
+
+clean-local:
+	test ! -f '$(TESTSUITE)' || \
+                $(SHELL) '$(TESTSUITE)' --clean
+
 AUTOM4TE = $(SHELL) $(top_srcdir)/missing --run autom4te
 AUTOTEST = $(AUTOM4TE) --language=autotest