Incorrect implementation of rfc3442 in RHEL6

Issue

• The /sbin/dhclient-script in versions prior to dhcp-4.1.1-19.P1.el6 expect that rfc3442 classless static routes are passed by the dhcp daemon in the environment variable new_classless_static_routes. It is however passed in the variable new_rfc3442_classless_static_routes.
  Furthermore, a simple rename of the variable does not suffice to solve the problem because the script somehow expects a different syntax of the contents of the variable.
  An example of the syntax we expect (and is compliant with rfc3442) is:

    new_rfc3442_classless_static_routes='24 192 168 10 192 168 1 1 8 10 10 17 66 41'
    specifies the routes:
    192.168.10.0/24 via 192.168.1.1
    10.0.0.0/8 via 10.10.17.66.41