[#4936] NetUtil can prevent using Netty due to SecurityManager denial
[#4936] NetUtil can prevent using Netty due to SecurityManager denial

Motivation:

A custom SecurityManager may prevent calling File.exists() and so throw a SecurityException in the static init block of NetUtil.

Modifications:

Correctly catch the exception and so allow to static init NetUtil.

Result:

Allow static init method of NetUtil to work even with custom SecurityManager.

tbrooks8/netty,fenik17/netty,Spikhalskiy/netty,ngocdaothanh/netty,carl-mastrangelo/netty,maliqq/netty,Squarespace/netty,mikkokar/netty,cnoldtree/netty,idelpivnitskiy/netty,johnou/netty,zer0se7en/netty,zer0se7en/netty,johnou/netty,NiteshKant/netty,bryce-anderson/netty,fenik17/netty,SinaTadayon/netty,fengjiachun/netty,fengjiachun/netty,SinaTadayon/netty,maliqq/netty,ngocdaothanh/netty,SinaTadayon/netty,idelpivnitskiy/netty,Squarespace/netty,skyao/netty,ejona86/netty,Spikhalskiy/netty,ichaki5748/netty,ngocdaothanh/netty,carl-mastrangelo/netty,Scottmitch/netty,maliqq/netty,golovnin/netty,artgon/netty,skyao/netty,Apache9/netty,andsel/netty,mcobrien/netty,mcobrien/netty,andsel/netty,doom369/netty,kiril-me/netty,golovnin/netty,fenik17/netty,luyiisme/netty,luyiisme/netty,bryce-anderson/netty,mcobrien/netty,KatsuraKKKK/netty,SinaTadayon/netty,ichaki5748/netty,ichaki5748/netty,Techcable/netty,Spikhalskiy/netty,yrcourage/netty,Squarespace/netty,mikkokar/netty,blucas/netty,Scottmitch/netty,jongyeol/netty,Squarespace/netty,carl-mastrangelo/netty,yrcourage/netty,carl-mastrangelo/netty,golovnin/netty,mikkokar/netty,Apache9/netty,jchambers/netty,netty/netty,jongyeol/netty,maliqq/netty,Scottmitch/netty,gerdriesselmann/netty,fengjiachun/netty,artgon/netty,cnoldtree/netty,artgon/netty,johnou/netty,Techcable/netty,Techcable/netty,Apache9/netty,zer0se7en/netty,fenik17/netty,luyiisme/netty,skyao/netty,gerdriesselmann/netty,s-gheldd/netty,cnoldtree/netty,zer0se7en/netty,yrcourage/netty,ngocdaothanh/netty,zer0se7en/netty,bryce-anderson/netty,andsel/netty,KatsuraKKKK/netty,blucas/netty,ejona86/netty,jongyeol/netty,mcobrien/netty,andsel/netty,golovnin/netty,bryce-anderson/netty,jongyeol/netty,kiril-me/netty,louxiu/netty,skyao/netty,tbrooks8/netty,kiril-me/netty,skyao/netty,s-gheldd/netty,fengjiachun/netty,kiril-me/netty,netty/netty,ejona86/netty,luyiisme/netty,tbrooks8/netty,s-gheldd/netty,idelpivnitskiy/netty,Techcable/netty,louxiu/netty,carl-mastrangelo/netty,kiril-me/netty,Squarespace/netty,NiteshKant/netty,netty/netty,Apache9/netty,netty/netty,ngocdaothanh/netty,andsel/netty,netty/netty,KatsuraKKKK/netty,gerdriesselmann/netty,jongyeol/netty,blucas/netty,artgon/netty,maliqq/netty,ejona86/netty,tbrooks8/netty,golovnin/netty,SinaTadayon/netty,yrcourage/netty,ichaki5748/netty,yrcourage/netty,doom369/netty,NiteshKant/netty,Scottmitch/netty,idelpivnitskiy/netty,KatsuraKKKK/netty,mcobrien/netty,Apache9/netty,Techcable/netty,fengjiachun/netty,mikkokar/netty,luyiisme/netty,jchambers/netty,jchambers/netty,Scottmitch/netty,Spikhalskiy/netty,jchambers/netty,jchambers/netty,blucas/netty,tbrooks8/netty,NiteshKant/netty,Spikhalskiy/netty,mikkokar/netty,doom369/netty,idelpivnitskiy/netty,gerdriesselmann/netty,s-gheldd/netty,cnoldtree/netty,cnoldtree/netty,bryce-anderson/netty,fenik17/netty,NiteshKant/netty,doom369/netty,johnou/netty,ichaki5748/netty,artgon/netty,louxiu/netty,ejona86/netty,s-gheldd/netty,KatsuraKKKK/netty,gerdriesselmann/netty,louxiu/netty,louxiu/netty,blucas/netty,doom369/netty,johnou/netty