Prompt to update unmodified configuration file during upgrade from Precise to Trusty

[Jean-Baptiste Lallement]

During upgrade from Precise to Trusty a prompt is showed to update /etc/dhcp.conf while this file hasn't been modified.

TEST CASE:
1. Install Lucid Server amd64
2. Upgrade to Precise
3. Upgrade to Trusty

EXPECTED RESULT
No prompt for unmodified configuration file

ACTUAL RESULT
Prompt to update /etc/dhcp/dhcp.conf

# diff -u dhclient.conf*
--- dhclient.conf 2014-04-01 10:30:19.107769901 +0200
+++ dhclient.conf.dpkg-new 2014-04-01 10:30:19.063769902 +0200
@@ -13,15 +13,18 @@

 option rfc3442-classless-static-routes code 121 = array of unsigned integer 8;

-send host-name "<hostname>";
+#send host-name "andare.fugue.com";
+send host-name = gethostname();
 #send dhcp-client-identifier 1:0:a0:24:ab:fb:9c;
 #send dhcp-lease-time 3600;
 #supersede domain-name "fugue.com home.vix.com";
 #prepend domain-name-servers 127.0.0.1;
 request subnet-mask, broadcast-address, time-offset, routers,
        domain-name, domain-name-servers, domain-search, host-name,
+ dhcp6.name-servers, dhcp6.domain-search,
        netbios-name-servers, netbios-scope, interface-mtu,
- rfc3442-classless-static-routes, ntp-servers;
+ rfc3442-classless-static-routes, ntp-servers,
+ dhcp6.fqdn, dhcp6.sntp-servers;
 #require subnet-mask, domain-name-servers;
 #timeout 60;
 #retry 60;

[Launchpad Janitor (janitor)]

This bug was fixed in the package isc-dhcp - 4.2.4-7ubuntu10

---------------
isc-dhcp (4.2.4-7ubuntu10) trusty; urgency=medium

  * Update old lucid configs to avoid conffile prompt. (LP: #1300654)
 -- Stephane Graber <email address hidden> Thu, 03 Apr 2014 18:34:49 -0400