ARM: Move setuptools to pip from apt

Try to fix build error on ARM

Dockerfile.raspbian

@@ -16,10 +16,10 @@ RUN apt-get update \
             python-paramiko \
             python-pexpect \
             python-pip \
-            python-setuptools \
             python-urllib3 \
             rsync \
             tahoe-lafs \
+        && pip install -U setuptools \
         && pip install -U boto b2 \
         && apt-get remove -y python-pip \
         && apt-get install -y --no-install-recommends \