Add EXTRA_CONFIGURE_OPTS for debian build

Just like ovs debian build, ovn debian build also need `EXTRA_CONFIGURE_OPTS` to config CFLAGS, jemalloc etc.

Submitted-at: #110
Signed-off-by: oilbeater <mengxin@alauda.io>
Signed-off-by: oilbeater <liumengxinfly@gmail.com>
Signed-off-by: Numan Siddique <numans@ovn.org>

AUTHORS.rst

@@ -266,7 +266,8 @@ Matteo Croce                       mcroce@redhat.com
 Matthias May                       matthias.may@neratec.com
 Mauricio Vásquez                   mauricio.vasquezbernal@studenti.polito.it
 Maxime Coquelin                    maxime.coquelin@redhat.com
-Mehak Mahajan
+Mehak Mahajaon
+Mengxin Liu                        mengxin@alauda.io
 Michael Arnaldi                    arnaldimichael@gmail.com
 Michal Weglicki                    michalx.weglicki@intel.com
 Mickey Spiegel                     mickeys.dev@gmail.com

debian/rules

@@ -30,7 +30,7 @@ override_dh_autoreconf:
 	dh_autoreconf $(DH_AS_NEEDED)
 
 override_dh_auto_configure:
-	dh_auto_configure -- --enable-ssl --enable-shared --with-ovs-source=${OVSDIR}
+	dh_auto_configure -- --enable-ssl --enable-shared --with-ovs-source=${OVSDIR} $(EXTRA_CONFIGURE_OPTS)
 
 override_dh_auto_test:
 ifeq (,$(filter nocheck,$(DEB_BUILD_OPTIONS)))