Updating tools/test/bin/onos-{config,install} to exit correctly

Last lines of both scripts are intended to be optional.
If they do not run, the script exits with non-zero status
which will break things like stc.

Change-Id: I6368f54be8356efe31ce75bc51b635d98e2ef033
diff --git a/tools/test/bin/onos-install b/tools/test/bin/onos-install
index 61bcb0e..2231667 100755
--- a/tools/test/bin/onos-install
+++ b/tools/test/bin/onos-install
@@ -103,4 +103,4 @@
 onos-config $node
 
 # Unless -n option was given, attempt to ignite the ONOS service.
-[ -z "$nostart" ] && onos-service $node start
+[ -z "$nostart" ] && onos-service $node start || true
\ No newline at end of file