Tests for MySQL/PostgreSQL/Cassandra integration are kinda broken, they expect
already initialized databases prepared for Kea tests.

We have to modify the autohelled Makefile.in instead of Makefile.am because Kea
requires old automake-1.15.

--- a/src/bin/admin/tests/Makefile.in
+++ b/src/bin/admin/tests/Makefile.in
@@ -389,8 +389,7 @@
 top_builddir = @top_builddir@
 top_srcdir = @top_srcdir@
 SUBDIRS = data .
-SHTESTS = memfile_tests.sh $(am__append_1) $(am__append_2) \
-	$(am__append_3)
+SHTESTS = memfile_tests.sh
 noinst_SCRIPTS = $(SHTESTS)
 EXTRA_DIST = dhcpdb_create_1.0.mysql dhcpdb_create_1.0.pgsql \
 	dhcpdb_create_1.0.cql