sanitycheck: clarify who spawns processes and threads and where

Notably fix the wrong comment I added in commit 6f011c95c477: when
testing with QEmu sanitycheck does _not_ spawn QEmu; it relies on "make
run" instead.

Searching the code for "Spawning" now cycles directly to all the places
starting processes and threads.

- Sample -v -v verbose output (lines wrapped for commit message check)

 Spawning QEMUHandler Thread for \
     qemu_x86/samples/hello_world/sample.helloworld 'make run'

- native_posix example:

 Spawning process /home/.../sanity-out/native_posix/\
    /samples/hello_world/sample.helloworld/zephyr/zephyr.exe
 Spawning BinaryHandler Thread for native_posix/\
     samples/hello_world/sample.helloworld

Signed-off-by: Marc Herbert <marc.herbert@intel.com>
1 file changed