We are currently wasting about 10 minutes per deploy waiting for
DHCP on interfaces that will never get it. By default, the timeout
seems to be 5 minutes (the 10 minutes is because we boot both the
IPA ramdisk and the deployed image, and each waits for 5 minutes),
which is excessively long to get a DHCP response. This change
shortens the time to 30 seconds. If an interface hasn't gotten a
response in 30 seconds, chances are it's not going to. A 30
second wait should reduce our wasted time to 1 minute, which is
more reasonable.
This is being done in the systemd unit file because the -timeout
option to dhclient doesn't seem to override what is configured in
dhclient.conf, and doing it in the systemd file means that this
change will be limited to only the interfaces configured by
dhcp-all-interfaces.
Change-Id: Ia8610e3def39c937eb0c861fdc9bc571ec39f9f4
Closes-Bug: 1626673
2747613ca2