Fixes user rights in log folder and introduces a common jitsi group.
Fixes user rights in log folder and introduces a common jitsi group.

jitsi/jicofo,DBatOWL/jicofo-mirror,DBatOWL/jicofo-mirror,aaronkvanmeerten/jicofo,aaronkvanmeerten/jicofo,DBatOWL/jicofo-mirror,Infywebrtcdev1/jicofo,jitsi/jicofo,aaronkvanmeerten/jicofo,mksh/jicofo,bhatvv/jicofo,martin7890/jicofo,Infywebrtcdev1/jicofo,mksh/jicofo,jitsi/jicofo,tsunli/jicofo,martin7890/jicofo,jitsi/jicofo,bhatvv/jicofo,tsunli/jicofo,bhatvv/jicofo,tsunli/jicofo,martin7890/jicofo,Infywebrtcdev1/jicofo,mksh/jicofo