Add test checking init/fini call order

This test is checking that loader complies with the order described in
http://www.sco.com/developers/gabi/latest/ch5.dynamic.html#init_fini

Bug: http://b/35201832
Test: bionic-unit-tests --gtest_filter=dl*:Dl*
Test: bionic-unit-tests-glibc --gtest_filter=dl*
Change-Id: I4cdf878c043112442c191e82aa9f5d5077e4d8c4