patch: Make dhcpd and dhcpc more configurable

[walter harms]

Hi list,
this patch makes the hardcoded paths for lease file  (udhcpd)
and default script (udhcpc) and conifg option.
There are no size changes. The patch function is only to make bb
more config friendly.

the patch is based on bb-1.9.1

re,
 wh
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