BTS_Tests: wait until BTS supplies stable signal

When running tests with real hardware it is important to wait for some
time (3 sec. should be enough) before exiting f_init(). This is to
ensure that the BTS supplies a stable carrier before the test proceeds.

Change-Id: Ib78633a33a15cd40514e15b6ebf9a0a8fb7b9c68
Related: OS#3863
1 file changed