Stabilize bgp_show_rtarget_group_test unit test

[Ananth Suryanarayana]

This test some times crashes in ~TashScheduler() most likely because enclosing ServerThread is already deleted

diff --git a/src/bgp/test/bgp_show_rtarget_group_test.cc b/src/bgp/test/bgp_show_rtarget
index 00ba56f..5e3be10 100644
--- a/src/bgp/test/bgp_show_rtarget_group_test.cc
+++ b/src/bgp/test/bgp_show_rtarget_group_test.cc
@@ -65,6 +65,7 @@ protected:
     virtual void TearDown() {
         evm_.Shutdown();
         server_->Shutdown();
+ thread_.Join();
         task_util::WaitForIdle();
     }

[OpenContrail Admin (ci-admin-f)]

Review in progress for https://review.opencontrail.org/30814
Submitter: Ananth Suryanarayana (<email address hidden>)

[OpenContrail Admin (ci-admin-f)]

Reviewed: https://review.opencontrail.org/30814
Committed: http://github.com/Juniper/contrail-controller/commit/8a1c02cd51deaf2a9ccd2713e113a117cecaa39d
Submitter: Zuul (<email address hidden>)
Branch: master

commit 8a1c02cd51deaf2a9ccd2713e113a117cecaa39d
Author: Ananth Suryanarayana <email address hidden>
Date: Thu Apr 27 15:04:45 2017 -0700

Stabilize bgp_show_rtarget_group_test unit test

Make sure that thread is terminated before ServerThread object
itself is destroyed

Change-Id: I42a8f07cc719feb06d35ee97b7272f5d920297b3
Closes-Bug: 1686846