Bazel release script: fix `gsutil -m`
Bazel release script: fix `gsutil -m`

commit f17fb3a816851b9f3a954c881e3fbc35bed5d6a6 added the `-m` in the wrong location,
causing the gsutil command to fail, e.g.
http://ci.bazel.io/view/Bazel%20bootstrap%20and%20maintenance/job/Bazel-Release/87/console

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MOS_MIGRATED_REVID=140589924

hermione521/bazel,cushon/bazel,kchodorow/bazel,safarmer/bazel,twitter-forks/bazel,twitter-forks/bazel,dropbox/bazel,ButterflyNetwork/bazel,dslomov/bazel-windows,bazelbuild/bazel,davidzchen/bazel,aehlig/bazel,safarmer/bazel,kchodorow/bazel-1,werkt/bazel,spxtr/bazel,juhalindfors/bazel-patches,kchodorow/bazel,snnn/bazel,meteorcloudy/bazel,kchodorow/bazel-1,perezd/bazel,werkt/bazel,variac/bazel,ButterflyNetwork/bazel,LuminateWireless/bazel,werkt/bazel,Asana/bazel,LuminateWireless/bazel,dslomov/bazel-windows,damienmg/bazel,ButterflyNetwork/bazel,spxtr/bazel,safarmer/bazel,Asana/bazel,katre/bazel,hermione521/bazel,cushon/bazel,spxtr/bazel,juhalindfors/bazel-patches,spxtr/bazel,mikelikespie/bazel,variac/bazel,twitter-forks/bazel,ulfjack/bazel,ButterflyNetwork/bazel,juhalindfors/bazel-patches,kchodorow/bazel,cushon/bazel,akira-baruah/bazel,bazelbuild/bazel,perezd/bazel,Asana/bazel,dslomov/bazel-windows,mikelikespie/bazel,dslomov/bazel,kchodorow/bazel,akira-baruah/bazel,hermione521/bazel,hermione521/bazel,davidzchen/bazel,twitter-forks/bazel,dropbox/bazel,ulfjack/bazel,dropbox/bazel,twitter-forks/bazel,spxtr/bazel,juhalindfors/bazel-patches,ulfjack/bazel,damienmg/bazel,aehlig/bazel,aehlig/bazel,cushon/bazel,ButterflyNetwork/bazel,dslomov/bazel,safarmer/bazel,twitter-forks/bazel,Asana/bazel,LuminateWireless/bazel,hermione521/bazel,perezd/bazel,damienmg/bazel,damienmg/bazel,bazelbuild/bazel,dslomov/bazel,safarmer/bazel,dslomov/bazel,dslomov/bazel-windows,davidzchen/bazel,Asana/bazel,meteorcloudy/bazel,perezd/bazel,kchodorow/bazel-1,werkt/bazel,mikelikespie/bazel,dropbox/bazel,perezd/bazel,kchodorow/bazel-1,snnn/bazel,aehlig/bazel,safarmer/bazel,Asana/bazel,snnn/bazel,LuminateWireless/bazel,akira-baruah/bazel,meteorcloudy/bazel,kchodorow/bazel,meteorcloudy/bazel,katre/bazel,akira-baruah/bazel,cushon/bazel,bazelbuild/bazel,bazelbuild/bazel,dslomov/bazel-windows,juhalindfors/bazel-patches,damienmg/bazel,spxtr/bazel,snnn/bazel,twitter-forks/bazel,mikelikespie/bazel,snnn/bazel,hermione521/bazel,variac/bazel,Asana/bazel,meteorcloudy/bazel,kchodorow/bazel,dslomov/bazel,dslomov/bazel,meteorcloudy/bazel,mikelikespie/bazel,ulfjack/bazel,juhalindfors/bazel-patches,variac/bazel,kchodorow/bazel-1,aehlig/bazel,aehlig/bazel,snnn/bazel,perezd/bazel,perezd/bazel,davidzchen/bazel,akira-baruah/bazel,kchodorow/bazel,meteorcloudy/bazel,ulfjack/bazel,akira-baruah/bazel,damienmg/bazel,bazelbuild/bazel,katre/bazel,ulfjack/bazel,dropbox/bazel,damienmg/bazel,mikelikespie/bazel,kchodorow/bazel-1,variac/bazel,davidzchen/bazel,katre/bazel,dslomov/bazel-windows,ButterflyNetwork/bazel,spxtr/bazel,katre/bazel,variac/bazel,katre/bazel,dropbox/bazel,snnn/bazel,cushon/bazel,dslomov/bazel,LuminateWireless/bazel,werkt/bazel,aehlig/bazel,davidzchen/bazel,ulfjack/bazel,werkt/bazel,variac/bazel,juhalindfors/bazel-patches,LuminateWireless/bazel,davidzchen/bazel