Update the android bot to Ubuntu 16.04

This gives us CMake > 2.8 and should hopefully help fixing rust-lang/rust#34559

Author: alexcrichton

slaves/android/Dockerfile

@@ -1,11 +1,11 @@
-FROM ubuntu:14.04
+FROM ubuntu:16.04
 
 RUN dpkg --add-architecture i386
 RUN apt-get -y update
 RUN apt-get -y install --force-yes \
         curl make git expect libncurses5:i386 libstdc++6:i386 zlib1g:i386 \
         python-dev python-pip stunnel \
-        g++-multilib openjdk-6-jre psmisc unzip cmake
+        g++-multilib openjdk-9-jre psmisc unzip cmake
 
 # Install buildbot and prep it to run
 RUN pip install buildbot-slave