LE Security Test Test: First successfull LE PTS test

Implementation of the first successful PTS test implementing
"Just Works IUT Initiator" test case.

Tag: #gd-refactor
Bug: 155399771
Test: gd/cert/run --host --test_filter=LeSecurityTest
Change-Id: I37582b65f4f5acb3ce5e855ea909a6665524d00e