Added "make test".

The selftest functions need some love!

    $ sudo make test
    TEST      lib.hardware.pci
    TEST      lib.hardware.vfio
    TEST      lib.hardware.bus
    TEST      lib.hardware.port
    ERROR     testlog/lib.hardware.port
    TEST      core.link_ring
    TEST      core.lib
    TEST      core.memory
    ERROR     testlog/core.memory
    TEST      core.timer
    TEST      apps.intel.intel_app
    ERROR     testlog/apps.intel.intel_app
    TEST      apps.intel.intel
    ERROR     testlog/apps.intel.intel
    TEST      apps.intel.intel10g
    ERROR     testlog/apps.intel.intel10g
    TEST      apps.ipv6.ipv6
    ERROR     testlog/apps.ipv6.ipv6
    TEST      apps.vhost.vhost
    ERROR     testlog/apps.vhost.vhost
    TEST      apps.vhost.vhost_apps
    ERROR     testlog/apps.vhost.vhost_apps
intel_app: Fixed selftest() function.

Needed to be updated after changes to the app module interface.