util: Fix mask for 172.16.0.0 private address range
util: Fix mask for 172.16.0.0 private address range

https://bugzilla.redhat.com/show_bug.cgi?id=905708

Only the first 12 bits should be set in the mask for this range. All
addresses between 172.16.0.0 and 172.31.255.255 are private.

iam-TJ/libvirt,jfehlig/libvirt,crobinso/libvirt,olafhering/libvirt,fabianfreyer/libvirt,jfehlig/libvirt,fabianfreyer/libvirt,agx/libvirt,siboulet/libvirt-openvz,shugaoye/libvirt,elmarco/libvirt,zhlcindy/libvirt-1.1.4-maintain,rlaager/libvirt,elmarco/libvirt,VenkatDatta/libvirt,VenkatDatta/libvirt,olafhering/libvirt,jardasgit/libvirt,eskultety/libvirt,andreabolognani/libvirt,nertpinx/libvirt,jardasgit/libvirt,VenkatDatta/libvirt,datto/libvirt,olafhering/libvirt,datto/libvirt,rlaager/libvirt,iam-TJ/libvirt,trainstack/libvirt,rlaager/libvirt,iam-TJ/libvirt,taget/libvirt,cbosdo/libvirt,andreabolognani/libvirt,jardasgit/libvirt,jfehlig/libvirt,zippy2/libvirt,jfehlig/libvirt,eskultety/libvirt,jardasgit/libvirt,zippy2/libvirt,agx/libvirt,crobinso/libvirt,taget/libvirt,taget/libvirt,rlaager/libvirt,elmarco/libvirt,datto/libvirt,agx/libvirt,siboulet/libvirt-openvz,shugaoye/libvirt,iam-TJ/libvirt,zhlcindy/libvirt-1.1.4-maintain,nertpinx/libvirt,trainstack/libvirt,agx/libvirt,zhlcindy/libvirt-1.1.4-maintain,zhlcindy/libvirt-1.1.4-maintain,libvirt/libvirt,crobinso/libvirt,cbosdo/libvirt,cbosdo/libvirt,elmarco/libvirt,nertpinx/libvirt,andreabolognani/libvirt,zhlcindy/libvirt-1.1.4-maintain,trainstack/libvirt,nertpinx/libvirt,zippy2/libvirt,taget/libvirt,eskultety/libvirt,VenkatDatta/libvirt,eskultety/libvirt,shugaoye/libvirt,nertpinx/libvirt,rlaager/libvirt,cbosdo/libvirt,shugaoye/libvirt,siboulet/libvirt-openvz,elmarco/libvirt,VenkatDatta/libvirt,eskultety/libvirt,libvirt/libvirt,trainstack/libvirt,iam-TJ/libvirt,olafhering/libvirt,jardasgit/libvirt,shugaoye/libvirt,zippy2/libvirt,iam-TJ/libvirt,siboulet/libvirt-openvz,iam-TJ/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,taget/libvirt,trainstack/libvirt,andreabolognani/libvirt,fabianfreyer/libvirt,siboulet/libvirt-openvz,crobinso/libvirt,agx/libvirt,cbosdo/libvirt,libvirt/libvirt,trainstack/libvirt,fabianfreyer/libvirt,datto/libvirt,trainstack/libvirt,datto/libvirt,libvirt/libvirt