dhcp: allow for excluding the external bind
There is a known issue when using ISC DHCP alongside bind 9.10. DHCP uses libraries
provided by bind and there is a bug which results in dhcpd/dhclient not
running in the background and not responding to sigterm.
The issue was first reported in 02/2015 by the fedora team here:
https://lists.isc.org/pipermail/bind-users/2015-February/094636.html
and as of 02/2018 it is still unresolved:
https://bugzilla.redhat.com/show_bug.cgi?id=
1457871
Fedora's workaround seems to consist of providing working libraries from the bind 9.9
package just for DHCP.
added 'ext-bind' in PACKACGECONFIG
added notes on how to enable the workaround
refreshed patches too
[ Yocto # 12744 ]
Signed-off-by: Armin Kuster <akuster808@gmail.com>
