Use 64 bits emulator to run android tests

Also install headless jre instead of the full jre.

src/ci/docker/arm-android/Dockerfile

@@ -13,7 +13,7 @@ RUN dpkg --add-architecture i386 && \
   cmake \
   unzip \
   expect \
-  openjdk-9-jre \
+  openjdk-9-jre-headless \
   sudo \
   libstdc++6:i386 \
   xz-utils \

src/ci/docker/arm-android/start-emulator.sh

@@ -10,7 +10,9 @@
 # except according to those terms.
 
 set -ex
-ANDROID_EMULATOR_FORCE_32BIT=true \
-  nohup nohup emulator @arm-18 -no-window -partition-size 2047 \
-  0<&- &>/dev/null &
+
+# Setting SHELL to a file instead on a symlink helps android
+# emulator identify the system
+export SHELL=/bin/bash
+nohup nohup emulator @arm-18 -no-window -partition-size 2047 0<&- &>/dev/null &
 exec "$@"