Merge "Detect leaks on host by default."

- refreshmod: Refresh list of modules for allmod/gomod.

Environment options:

- SANITIZE_HOST: Set to 'true' to use ASAN for all host modules. Note that

                 ASAN_OPTIONS=detect_leaks=0 will be set by default until the

                 build is leak-check clean.

- SANITIZE_HOST: Set to 'true' to use ASAN for all host modules.

- ANDROID_QUIET_BUILD: set to 'true' to display only the essential messages.

Look at the source to view more functions. The complete list is:

    export ANDROID_BUILD_TOP=$(gettop)

    # With this environment variable new GCC can apply colors to warnings/errors

    export GCC_COLORS='error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01'

    export ASAN_OPTIONS=detect_leaks=0

}

function set_sequence_number()