[Test/Scaffolding] Prepare test for the new layer

[Test/Scaffolding] Prepare test for the new layer

For now, layer test is too cluttered so that it is not agile enought to
make any change.

This PR mainly separates the tests into two parts to make the test
scallable itself.

1. Layer only test leaving inside `unittest_layers_{layer_name}`
2. Common tests like setProperty, golden_test in `layers_common_tests.h`

**Self evaluation:**
1. Build test: [X]Passed [ ]Failed [ ]Skipped
2. Run test: [X]Passed [ ]Failed [ ]Skipped

Signed-off-by: Jihoon Lee <jhoon.it.lee@samsung.com>