arm: disable another flaky test.
arm: disable another flaky test.

these tests work fine on n1 and gumstix. it's unclear
why they keep failing on the godashboard build.

R=rsc
CC=golang-dev
http://codereview.appspot.com/1664056

gnanderson/go,tv42/old-go,dsriram/golang,h8liu/golang,h8liu/golang,gnanderson/go,dsriram/golang,h8liu/golang,pombredanne/go-deleteme,ssrl/go,dsriram/golang,tv42/old-go,pombredanne/go-deleteme,pombredanne/go-deleteme,ssrl/go,tv42/old-go,ssrl/go,h8liu/golang,gnanderson/go,tv42/old-go,ssrl/go,apparentlymart/golang,apparentlymart/golang,pombredanne/go-deleteme,h8liu/golang,h8liu/golang,gnanderson/go,dsriram/golang,apparentlymart/golang,dsriram/golang,ssrl/go,h8liu/golang,dsriram/golang,gnanderson/go,pombredanne/go-deleteme,tv42/old-go,tv42/old-go,ssrl/go,apparentlymart/golang,pombredanne/go-deleteme,dsriram/golang,tv42/old-go,apparentlymart/golang,apparentlymart/golang,apparentlymart/golang,gnanderson/go,pombredanne/go-deleteme,gnanderson/go,ssrl/go