Description of problem:

Some NICs sometimes fail to get IP during boot up.
To work around the problem, recent RHELs provide "LINKDELAY=" parameter
in /etc/sysconfig/network-scripts/ifcfg-eth<X> file.

For example of RHEL6.3 Techinical Notes:
> 3.6. Networking
>   kernel component
>     Some e1000e NICs may not get an IPv4 address assigned after
>     the system is rebooted. To work around this issue, add the following
>     line to the /etc/sysconfig/network-scripts/ifcfg-eth<X> file:
>
>       LINKDELAY=10

Because this can happen on the first boot up just after install
and then all test fails before starting any test, this cannot be
worked around by a test.

The snippet below provides "linkdelay=" kickstart metadata which
adds "LINKDELAY=" parameter to the config file of the active NIC.

--------------------------------------------------------------------------------
{% if linkdelay %}
IFACE=$(route -n 2> /dev/null | awk '/^0\.0\.0\.0/ {print $8}' | tail -n 1)
echo "LINKDELAY={{ linkdelay }}" >> /etc/sysconfig/network-scripts/ifcfg-$IFACE
{% endif %}
--------------------------------------------------------------------------------

Please add such a feature to the stage of kickstart %post.
(e.g. somewhere in the rhts_post snippet or so)