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To customise test builds and support test related features such as time
stamps and a boot banner, introduce a Makefile variant that is dedicated
to testing.

Initially we introduce a new config overlay that is used for all tests, in
this case we enable BOOT_BANNER and BUILD_TIMESTAMP. This will print the
current version and the date, useful when reporting bugs and also an
indicator that the system has booted before the test has started.

For example:

[QEMU] CPU: qemu32
***** BOOTING ZEPHYR OS v1.6.99 - BUILD: Dec 21 2016 19:57:13 *****
tc_start() - Test Nanokernel CPU and thread routines
Initializing nanokernel objects
...
..

Change-Id: I224318cdeb55a301964ea366dbc577e2e3a09175
Signed-off-by: Anas Nashif <anas.nashif@intel.com>