Update ADD handling in Dockerfiles and test bundle creation

blimp/engine/testing/Dockerfile

Index: blimp/engine/testing/Dockerfile
diff --git a/blimp/engine/testing/Dockerfile b/blimp/engine/testing/Dockerfile
index 71c87fc8f93373d464d83d126631c2e39d2a78da..b50e979b5701b7add9321e42f718e0256e437b80 100644
--- a/blimp/engine/testing/Dockerfile
+++ b/blimp/engine/testing/Dockerfile
@@ -4,15 +4,13 @@
 # Engine itself.
 FROM base:latest
 
-RUN mkdir -p /out/test/
+RUN mkdir -p /blimp/out/test
 
-# The glob below expands to all files, but does not add directories
-# recursively.
-# Test binaries assume src directory is 2 levels down. While this behavior can
-# be changed with flags, the directory structure is set up to minimize
-# potential problems with initial integration.
-ADD * /out/test/
+RUN useradd -ms /bin/bash blimp_user
 
-RUN chown -R blimp_user /out/test/
+# Copy complete docker root dir into /blimp directory.
+ADD . /blimp/
+
+RUN chown -R blimp_user /blimp
 
 USER blimp_user