ibverbs-tests: Add GTEST infrastructure

This commit introduced the GTEST infrastructure support.

$ ./out/ibv_test
Running main() from main.cc
[==========] Running 0 tests from 0 test cases.
[==========] 0 tests from 0 test cases ran. (0 ms total)
[  PASSED  ] 0 tests.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
10 files changed