Fix selenium imports on tests

tests require selenium to be installed, no matter if
integration tests or selenium tests are executed or
not.

Change-Id: Ie55d64c19b00b5b22f62948d4a24a3f322082b0c
Closes-Bug: #1289270

run_tests.sh

@@ -296,6 +296,10 @@ function run_tests {
     export SKIP_UNITTESTS=1
   fi
 
+  if [ $with_selenium -eq 0 -a $integration -eq 0 ]; then
+      testopts="$testopts --exclude-dir=openstack_dashboard/test/integration_tests"
+  fi
+
   if [ -z "$testargs" ]; then
      run_tests_all
   else