Placeholder DHCP user scripts were added recently. These files make package-based installations of such scripts more difficult. Pull user callbacks from directories instead to allow packages and users to install co-existing scripts more easily. References:130118f7anetifd: add a udhcpc.user placeholder script Signed-off-by: Leon M. George <leon@georgemail.eu> Signed-off-by: Hans Dedecker <dedeckeh@gmail.com> [PKG_RELEASE increase] (cherry picked from commit467c32600c)