tests: Organize the test code to make it modular

The unit test code for libpldmresponder, host-bmc and common is
in a shared test directory. This patch separates the test code
to the

tests: Organize the test code to make it modular

The unit test code for libpldmresponder, host-bmc and common is
in a shared test directory. This patch separates the test code
to the respective directory.

Tested: Ran the unit test and tests passed.

Signed-off-by: Tom Joseph <rushtotom@gmail.com>
Change-Id: I31d53681fa6c0d8bc6eb7c4e3341aaff4bc341ee

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