VPP-669: ping: fix coverity check error 165075 + add ping testcase 56/5856/7
authorAndrew Yourtchenko <ayourtch@gmail.com>
Fri, 24 Mar 2017 16:46:42 +0000 (17:46 +0100)
committerDamjan Marion <dmarion.lists@gmail.com>
Thu, 30 Mar 2017 11:56:32 +0000 (11:56 +0000)
Fix the bug and add the unit test to start with ping test coverage

Change-Id: Ibeacbed1f1660e677faa2dbb2ebe386216693e96
Signed-off-by: Andrew Yourtchenko <ayourtch@gmail.com>

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