DHCP set hostname is not working.

Issue: hostnames should be auto-configured using DHCP at boot, but they are not.

We currently rely on sadm/python-lib/prologin/set_hostname.py to set the hostname, which is hacky and not a good solution.

Proposed fix: As seen on http://www.bctes.com/dhcpd.conf.5.html the DHCP hostname configuration is enabled using the host-name option, which we do not have activated on our present setup. An even better option is use-host-decl-names. Extract from dhcpcd.conf(5):

The use-host-decl-names statement

         use-host-decl-names flag;

         If the use-host-decl-names parameter is true in a given  scope,  then
         for  every  host declaration within that scope, the name provided for
         the host declaration will be supplied to the client as its  hostname.
         So, for example,

             group {
               use-host-decl-names on;

               host joe {
                 hardware ethernet 08:00:2b:4c:29:32;
                 fixed-address joe.fugue.com;
               }
             }

         is equivalent to

               host joe {
                 hardware ethernet 08:00:2b:4c:29:32;
                 fixed-address joe.fugue.com;
                 option host-name "joe";
               }

Test procedure:

Add use-host-decl-names on in dhpcd.conf
Remove set_hostname,py (revert 83b5cdc11b01862fb5314ef3f97120cd268a6663 and childs)
Boot a machine with PXE and DHCP

Expected results:

DHCP offers should contain the host-name option. Debug using tcpdump/wireshark.
The machine should use the DHCP hostname. Hostname is displayed on kdm.

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