rename ktap_dir to kp_dir_dentry

Also pass this global struct dentry to transport module in
function argument.

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

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>
allow branch profiling for ktapvm in Makefile

ktap don't support branch profiling now, so it's have no
reason to let kernel branch profiling not see ktapvm branch
profiling stats.

Signed-off-by: zhangwei(Jovi) <jovi.zhangwei@gmail.com>
rename count variable into n

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