Added discovery auth support in fabric module.
Added discovery auth support in fabric module.

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