Made NetworkPortal's port argument optional
Made NetworkPortal's port argument optional

* Defaults to 3260

roidayan/rtslib,Datera/rtslib,Datera/rtslib,cvubrugier/rtslib-fb,roidayan/rtslib,mikenawrocki/rtslib-fb,agrover/rtslib-fb,mikenawrocki/rtslib-fb