handover_test: gitignore

We decided not to keep the handover_test script expected outputs
(osmo-bsc's logging output) in the source tree. For manual comparison,
they are still produced by 'handover_tests.sh -u', ignore them.

Change-Id: I5dda03f21b568e07cf26501ba2e0683108d408b6
diff --git a/.gitignore b/.gitignore
index c7b14bf..6a8d2c1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -71,6 +71,9 @@
 tests/testsuite
 tests/testsuite.log
 
+tests/handover/test*.ok
+tests/handover/test*.err
+
 writtenconfig/
 
 # manuals