plugins: Install unit tests
plugins: Install unit tests

Bug: https://jira.iotivity.org/browse/IOT-524
Change-Id: Ic4eca5d07e3a9e8c5fb7b2201a483b659a020d76
Signed-off-by: Philippe Coval <ff46fec9739d31cce915aabcc3a7a2c00eee4d6c@osg.samsung.com>

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