Remove IP rule cmds from netutils_wrappers

There are two vendor specific IP rule commands in netutils_wrapper:

CMD "ip( -4| -6)? rule .* goto 13000 prio 11999"
CMD "ip( -4| -6)? rule .* prio 25000"

The first one was replaced by other solution (output-mark in IPSec SA)
in vendor side. The second one was used by the obsolete chipset msm8998.
These commands are no more valid, since IP rule priorities has been
renumbered in Android S.

Bug: 186515196
Bug: 62135790
Test: m netutils-wrapper-1.0; adb push ...; atest NetUtilsWrapperTest10
Change-Id: Ie7aba9dfd68092c88b44b660164801c1ae7aeded