Remove all complex logic after forking.
Remove all complex logic after forking.

This is so that there is as little room for undesired behavior (e.g.
deadlocks), which can happen when multi-threaded programs fork if the code is
not written *very* carefully. See the comment before ExecuteDaemon() in
blaze_util_posix.cc for an detailed treatise on the matter.

RELNOTES: None.
PiperOrigin-RevId: 155750707

perezd/bazel,snnn/bazel,dslomov/bazel,damienmg/bazel,ulfjack/bazel,davidzchen/bazel,safarmer/bazel,safarmer/bazel,werkt/bazel,dslomov/bazel,variac/bazel,dslomov/bazel-windows,snnn/bazel,perezd/bazel,meteorcloudy/bazel,meteorcloudy/bazel,katre/bazel,ButterflyNetwork/bazel,juhalindfors/bazel-patches,werkt/bazel,twitter-forks/bazel,snnn/bazel,akira-baruah/bazel,damienmg/bazel,davidzchen/bazel,aehlig/bazel,cushon/bazel,meteorcloudy/bazel,bazelbuild/bazel,ButterflyNetwork/bazel,spxtr/bazel,davidzchen/bazel,dropbox/bazel,akira-baruah/bazel,meteorcloudy/bazel,juhalindfors/bazel-patches,safarmer/bazel,meteorcloudy/bazel,juhalindfors/bazel-patches,davidzchen/bazel,werkt/bazel,aehlig/bazel,ulfjack/bazel,juhalindfors/bazel-patches,bazelbuild/bazel,ButterflyNetwork/bazel,variac/bazel,safarmer/bazel,ulfjack/bazel,perezd/bazel,spxtr/bazel,snnn/bazel,davidzchen/bazel,juhalindfors/bazel-patches,akira-baruah/bazel,dropbox/bazel,snnn/bazel,katre/bazel,perezd/bazel,aehlig/bazel,werkt/bazel,akira-baruah/bazel,twitter-forks/bazel,ButterflyNetwork/bazel,bazelbuild/bazel,werkt/bazel,katre/bazel,twitter-forks/bazel,twitter-forks/bazel,bazelbuild/bazel,dropbox/bazel,damienmg/bazel,aehlig/bazel,cushon/bazel,ButterflyNetwork/bazel,spxtr/bazel,dropbox/bazel,ulfjack/bazel,perezd/bazel,variac/bazel,snnn/bazel,ulfjack/bazel,twitter-forks/bazel,katre/bazel,variac/bazel,dslomov/bazel-windows,aehlig/bazel,dslomov/bazel,ulfjack/bazel,dslomov/bazel-windows,dslomov/bazel-windows,aehlig/bazel,ButterflyNetwork/bazel,spxtr/bazel,twitter-forks/bazel,spxtr/bazel,damienmg/bazel,cushon/bazel,variac/bazel,dslomov/bazel,juhalindfors/bazel-patches,bazelbuild/bazel,twitter-forks/bazel,spxtr/bazel,damienmg/bazel,akira-baruah/bazel,snnn/bazel,dslomov/bazel,damienmg/bazel,davidzchen/bazel,dropbox/bazel,katre/bazel,aehlig/bazel,dslomov/bazel,akira-baruah/bazel,variac/bazel,spxtr/bazel,davidzchen/bazel,werkt/bazel,meteorcloudy/bazel,meteorcloudy/bazel,dslomov/bazel,damienmg/bazel,bazelbuild/bazel,safarmer/bazel,dropbox/bazel,perezd/bazel,dslomov/bazel-windows,safarmer/bazel,perezd/bazel,juhalindfors/bazel-patches,variac/bazel,ulfjack/bazel,cushon/bazel,dslomov/bazel-windows,katre/bazel,cushon/bazel,cushon/bazel