port test suite to Android to run in emulator

Attached is the first stab at getting something from the test suite running in Android.

• there is no /tmp on Android, there is /data/local/tmp for root and the shell user
• no use in testing the user ID stuff, Android apps cannot ever change users

To get the full suite running, there will need to be larger changes:

• either switch Python code to plain sh or hack to get Python running in Android emulator
• port sh scripts to Android, it is not a full UNIX environment, so things like printf and others are not always there.
• the shebang will need to be settable to #!/system/bin/sh or the tests need to be executed using sh test_keygen.sh