fix[lua_scripts]:add default values for tonumber
fix[lua_scripts]:add default values for tonumber

- add default values for the integer vars converted by tonumber()

Signed-off-by: Steven Zou <5c7d09ecc61eee689df7048be4e7fb1d1e0b8ebc@vmware.com>

wy65701436/harbor,wy65701436/harbor,reasonerjt/harbor,wy65701436/harbor,reasonerjt/harbor,reasonerjt/harbor,reasonerjt/harbor,reasonerjt/harbor,wy65701436/harbor,wy65701436/harbor,reasonerjt/harbor,wy65701436/harbor