pkg/ipc: use /data/ for storage in fuchsia. (#1101)
pkg/ipc: use /data/ for storage in fuchsia. (#1101)

We cannot create folders in other directories anymore, for now, we only
have access to create directories in /data/. This change is temporary as
we move to a component-based world.
xairy/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,google/syzkaller,xairy/syzkaller,google/syzkaller,xairy/syzkaller,xairy/syzkaller,google/syzkaller