pkg/ipc: don't use rate limiting for test os
pkg/ipc: don't use rate limiting for test os

It's not needed for test os and slows down pkg/runtest tests.

google/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller