Replace print "" with print("") everywhere

Towards Python 3 compatibility

Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com>
Fix broken interactive plot mode (--rings-show parameter)

Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com>
Fix function offset display (remove trailing L)

Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com>
Default kernel path is current directory

Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com>