Add dalvik.vm.force-java-zygote-fork-loop

Bug: 192020504
Test: Check logcat with and without the flag.
Change-Id: Ia46a011125a6e245bbd9065d708d1f905d56e3af
Merged-In: Ia46a011125a6e245bbd9065d708d1f905d56e3af
(cherry picked from commit f2a815dc)