UBUNTU: [debian] move build tests out of the way

The new Debian autopkgtest system takes ownership of the debian/tests
directory, in such a way that is incompatible with our usage.  Move our
tests to debian/tests-build as they are build tests.

BugLink: http://bugs.launchpad.net/bugs/1081500Signed-off-by: Andy Whitcroft <apw@canonical.com>

debian/rules.d/2-binary-arch.mk

@@ -254,7 +254,7 @@ endif
 	 PREV_REVISION="$(prev_revision)" ABI_NUM="$(abinum)"		\
 	 PREV_ABI_NUM="$(prev_abinum)" BUILD_DIR="$(builddir)/build-$*"	\
 	 INSTALL_DIR="$(pkgdir)" SOURCE_DIR="$(CURDIR)"			\
-	 run-parts -v $(DROOT)/tests
+	 run-parts -v $(DROOT)/tests-build
 
 	#
 	# Remove files which are generated at installation by postinst,