client: wait for optional leases, just don't fail

When waiting for a group-optional lease pair (dhcp4 or dhcp6) and
one arrives, wait for the second one until timeout and recheck the
results then (bnc#876848,bnc#879127).
ifdown: do not try to fire nanny, it is not hired

We do not install nanny policies by default in ifup, so it is
not needed to try to delete them in ifdown. There is currently
no nanny started in inst-sys and the attempt is causing ifdown
to run into timeouts (bnc#876848,bnc#879127).
rpm: drop useless ghost dirs in spec (bnc#873857)
Merge pull request #258 from mtomaschewski/drop-ghosts

rpm: drop useless ghost dirs in spec (bnc#873857)
Merge pull request #257 from mtomaschewski/dhcp4or6

fixes for dhcp4,dhcp6 and ifdown/ifreload issues (bnc#876848,bnc#879127)
version 0.5.26
dhcp4: strip domain when sending a hostname option
Merge pull request #261 from mtomaschewski/dhcp4-hostname

dhcp4: strip domain when sending a hostname option
ipv4: new default to send gratuitous arp

Consider new suse ifcfg variable default SEND_GRATUITOUS_ARP=auto
for arp-notify, enabling to send gratuitous arp by default, when
duplicate IPv4 check is enabled via arp-verify/CHECK_DUPLICATE_IP
and the check were successful (bnc#879911,fate#314399).
arp: no verify/notify if not applicable for device
ifconfig: fix for an unitialized error return code
dbus: do not close shared connections (bnc#880124)
hostname: reload syslog after change (bnc#874161)
Merge pull request #264 from mtomaschewski/reload-syslog

hostname: reload syslog after change (bnc#874161)
compat: apply DHCLIENT_ROUTE_PRIORITY (bnc#879842)
dhcp4: set a protocol dhcp hint to all routes
addrconf: added a lease priority function
routes: added equal destination/gateway utilities
server: do not apply duplicate routes (bnc#879842)
Merge pull request #262 from mtomaschewski/auto-garp