Fix the tuned optimizations

Fix the tuned optimizations

tuned-adm is now run through check_prox_system_setup.sh at the first
system startup/reboot. This will result in the correct grub cmdline
parameters.
We are also coying the default rapid_rsa_key in the authorized_keys of
the rapid user, which is now the default user to run the tests.
Fixed also an issue in handle_mirror.c: using now ETYPE_IPv4.
Changed deploycentostools.sh to reflect the changes done when building
the image with disk-image-create.

Change-Id: I5933d21faef9fe02b56c01d0b96e2c143cc5476d
Signed-off-by: Luc Provoost <luc.provoost@intel.com>