resolvconf: restore RESTARTCMD=, CMD1=, CMD2= and sed pattern as before.

r312992 removed RESTARTCMD_WITH_ARG for @RESTARTCMD something@ but
reverted the sed to be '@RESTARTCMD \(.*\)@' and RESTARTCMD= to be
the value of RESTARTCMD_WITH_ARG.

Submitted by: Guy Yur
x_MFC with: r312992