Use constraints to avoid CN. Tweak error msgs.
Use constraints to avoid CN. Tweak error msgs.

Use CreateOffer/Answer constraints to ensure that the SDP doesn't contain CN; remove obsolete code to do this manually.
TheKnarf/apprtc,jessetane/testrtc,TribeMedia/testrtc,procandi/apprtc,dengshaodong/docker-apprtc,bpyoung92/apprtc,sarandogou/webrtc,YouthAndra/apprtc,procandi/samples,Zauberstuhl/adapter,mulyoved/samples,harme199497/adapter,Zauberstuhl/adapter,procandi/apprtc,smayoorans/samples,xdumaine/samples,mvenkatesh431/samples,mvenkatesh431/apprtc,harme199497/adapter,shelsonjava/apprtc,Temasys/Google-WebRTC-Samples,guoweis/webrtc,fetterov/samples,aadebuger/docker-apprtc,smbale/samples,oliverhuangchao/samples,ralic/testrtc,webrtc/apprtc,pquochoang/samples,TribeMedia/apprtc,jarl-alejandro/apprtc,jjrasche/cell-based-RC-control,mauricionr/samples,bemasc/samples,TheKnarf/apprtc,rajsek/webrtc,guoweis/webrtc,shelsonjava/testrtc,ralic/samples,fippo/apprtc,oliverhuangchao/samples,diddie06/webrtc,dajise/samples,overtakermtg/samples,knightsofaa/webrtc,askdaddy/samples,smayoorans/samples,dajise/samples,samdutton/apprtc,virajs/samples,samdutton/apprtc,82488059/apprtc,dajise/samples,TheKnarf/apprtc,juberti/samples,YouthAndra/apprtc,fitraditya/samples,bpyoung92/apprtc,fippo/apprtc,martin7890/samples,jessetane/testrtc,jarl-alejandro/apprtc,Zauberstuhl/adapter,jiayliu/apprtc,EmreAkkoyun/sample,smadhusu/AppRTC,volkanh/volkanh.github.io,4lejandrito/adapter,calebboyd/adapter,samdutton/webrtc,mulyoved/samples,shelsonjava/samples,TribeMedia/apprtc,todotobe1/apprtc,4lejandrito/adapter,TribeMedia/samples,arnauorriols/apprtc,jjrasche/cell-based-RC-control,todotobe1/samples,kosmosby/Google-WebRTC-Samples,webrtc/apprtc,myself659/samples,shelsonjava/testrtc,mauricionr/samples,JiYou/apprtc,arnauorriols/apprtc,JiYou/apprtc,todotobe1/apprtc,fippo/apprtc,akashrchoksi/newone,virajs/samples,bpyoung92/apprtc,shelsonjava/testrtc,calebboyd/adapter,Temasys/Google-WebRTC-Samples,TribeMedia/apprtc,xdumaine/adapter,procandi/samples,procandi/samples,Edward-Shawn/samples,bemasc/samples,fippo/apprtc,shelsonjava/apprtc,TheKnarf/apprtc,keshwans/samples,fitraditya/samples,jessetane/testrtc,shelsonjava/apprtc,tsruban/samples,todotobe1/apprtc,TribeMedia/testrtc,smayoorans/samples,martin7890/samples,ralic/samples,shelsonjava/testrtc,TribeMedia/testrtc,procandi/apprtc,juberti/samples,leehz/samples,virajs/testrtc,virajs/samples,TribeMedia/testrtc,smbale/samples,shines/adapter,volkanh/volkanh.github.io,virajs/apprtc,ralic/samples,shelsonjava/samples,jjrasche/cell-based-RC-control,Roarz/samples,virajs/testrtc,jiayliu/apprtc,virajs/apprtc,bbandaru/samples,myself659/samples,overtakermtg/samples,dengshaodong/docker-apprtc,knightsofaa/webrtc,akashrchoksi/newone,askdaddy/samples,82488059/apprtc,procandi/apprtc,fitraditya/samples,todotobe1/samples,myself659/samples,dushmis/webrtc,82488059/apprtc,jan-ivar/adapter,bpyoung92/apprtc,webrtc/adapter,jiayliu/apprtc,EmreAkkoyun/sample,jiayliu/apprtc,webrtc/apprtc,Edward-Shawn/samples,webrtc/samples,calebboyd/adapter,taylor-b/samples,jarl-alejandro/apprtc,mulyoved/samples,TribeMedia/apprtc,todotobe1/apprtc,fetterov/samples,mvenkatesh431/samples,MahmoudFouad/samples,TribeMedia/samples,shines/adapter,jarl-alejandro/apprtc,jan-ivar/adapter,virajs/apprtc,samdutton/webrtc,dengshaodong/docker-apprtc,webrtc/apprtc,webrtc/testrtc,MahmoudFouad/samples,diddie06/webrtc,xdumaine/samples,pquochoang/samples,bbandaru/samples,webrtc/testrtc,TheKnarf/apprtc,bpyoung92/apprtc,tsruban/samples,xdumaine/samples,mvenkatesh431/apprtc,b-cuts/samples,jjrasche/cell-based-RC-control,JiYou/apprtc,jiayliu/apprtc,Acidburn0zzz/adapter,dushmis/webrtc,keshwans/samples,oliverhuangchao/samples,mvenkatesh431/apprtc,overtakermtg/samples,aadebuger/docker-apprtc,fippo/webrtc,virajs/apprtc,virajs/testrtc,xdumaine/adapter,bbandaru/samples,leehz/samples,aadebuger/docker-apprtc,smadhusu/AppRTC,Acidburn0zzz/adapter,ralic/testrtc,4lejandrito/adapter,ralic/testrtc,mvenkatesh431/apprtc,tsruban/samples,samdutton/apprtc,ralic/testrtc,harme199497/adapter,kod3r/samples,YouthAndra/apprtc,TribeMedia/apprtc,pquochoang/samples,aadebuger/docker-apprtc,82488059/apprtc,kod3r/samples,fippo/webrtc,b-cuts/samples,leehz/samples,82488059/apprtc,Acidburn0zzz/adapter,jarl-alejandro/apprtc,webrtc/adapter,jan-ivar/samples,MahmoudFouad/samples,JiYou/apprtc,b-cuts/samples,arnauorriols/apprtc,shelsonjava/apprtc,arnauorriols/apprtc,virajs/testrtc,todotobe1/apprtc,virajs/apprtc,bemasc/samples,arnauorriols/apprtc,Roarz/samples,mauricionr/samples,shaohung001/samples,fetterov/samples,samdutton/apprtc,martin7890/samples,EmreAkkoyun/sample,JiYou/apprtc,smadhusu/AppRTC,shines/adapter,todotobe1/samples,YouthAndra/apprtc,mvenkatesh431/samples,Roarz/samples,shelsonjava/apprtc,jessetane/testrtc,kod3r/samples,shelsonjava/samples,smbale/samples,YouthAndra/apprtc,webrtc/apprtc,Edward-Shawn/samples,samdutton/apprtc,taylor-b/samples,smadhusu/AppRTC,aadebuger/docker-apprtc,webrtc/samples,shaohung001/samples,dengshaodong/docker-apprtc,akashrchoksi/newone,fippo/apprtc,guoweis/webrtc,volkanh/volkanh.github.io,jan-ivar/samples,dengshaodong/docker-apprtc,smadhusu/AppRTC,TribeMedia/samples,procandi/apprtc,mvenkatesh431/apprtc