Description of problem:
dhclient-script:646 executes the following two statements:

CONFIG="ifcfg-${interface}"
need_config ${CONFIG}

network-functions:need_config() on the other hand, expects CONFIG to contain the interface, without the "ifcfg-" bit as so:

need_config ()
{
    local nconfig

    CONFIG="ifcfg-${1}"
[...]

Therefore, dhclient-script should be corrected to pass the correct value (${interface}), instead of "ifcfg-${interface}".

Version-Release number of selected component (if applicable):
dhclient 4.2, FC17

How reproducible:
Always

Steps to Reproduce:
1. Self-evident from dhclient-script sources supplied with the above package and standard ifup/ifdown network scripts in /etc/sysconfig/network-scripts
2.
3.
  
Actual results:
See above

Expected results:
dhclient-script to contain the following 2 statements:

CONFIG="${interface}"
need_config ${CONFIG}

as this is what network-functions:need_config() is expecting.

Additional info: