Adds workaround for Android lint Docker build failure.
Adds workaround for Android lint Docker build failure.

For some reason "android update" is failing to unpack the new tools and
obliterating the /tools dir in the process. But we can do by hand what
"android update" is failing to do: unpack the downloaded zip into /tools.

Issue: https://github.com/google/shipshape/issues/27

google/shipshape,google/shipshape,google/shipshape,google/shipshape,google/shipshape,google/shipshape,google/shipshape