rhel: Fix tests on mock and koji

Currently many tests fails on mock/koji since /etc/resolv.conf is not
present. The unexpected warning causes them to abort.

After this patch an empty resolv.conf is created and used before issuing
"make check".

Acked-by: Flavio Leitner <fbl@sysclose.org>
Signed-off-by: Timothy Redaelli <tredaelli@redhat.com>
Signed-off-by: Ben Pfaff <blp@ovn.org>

rhel/openvswitch-fedora.spec.in

@@ -302,6 +302,8 @@ rm -f $RPM_BUILD_ROOT%{_libdir}/libovn*
 
 %check
 %if %{with check}
+    touch resolv.conf
+    export OVS_RESOLV_CONF=$(pwd)/resolv.conf
     if make check TESTSUITEFLAGS='%{_smp_mflags}' RECHECK=yes; then :;
     else
         cat tests/testsuite.log

rhel/ovn-fedora.spec.in

@@ -212,6 +212,8 @@ rm -rf $RPM_BUILD_ROOT%{_sysconfdir}/logrotate.d/openvswitch
 
 %check
 %if %{with check}
+    touch resolv.conf
+    export OVS_RESOLV_CONF=$(pwd)/resolv.conf
     if make check TESTSUITEFLAGS='%{_smp_mflags}' RECHECK=yes; then :;
     else
         cat tests/testsuite.log