minor typo update on Kconfig

Use "ktap" instead of "KTAP" in Kconfig, also add
tutorial link in Kconfig.

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>
delete doc/presentation

Those slides will move to website(www.ktap.org),
delete it in git tree.

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>
ktapvm: add module parameter for non-mainthread execution limit

Sometimes tetris script report exceed max exec count, the
reason is tetris may execute instruction exceed 10000 in
timer context.

Basically 10000 exec count is pretty large for most script,
so let that value to be configurable for special case like
tetris script, then user can change it when load ktapvm module,
or change it via sysfs at run time.

Signed-off-by: Tadaki SAKAI <stadaki.dev@gmail.com>
Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>
ktapvm: rename kp_exec_count_max to kp_max_exec_count

This patch also fix the error report when exceed kp_max_exec_count.

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>
ktap/scripts: add note for tetris.kp(enlarge max_exec_count to 500000)

Change that value by below command:
sudo echo 50000 > /sys/module/ktapvm/parameters/max_exec_count

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>