Drop domain from supersede-hostname in dhcp conf

In the configuration file for dhclient, make sure to set the hostname without
the domain name (which is specified in a separate setting).
Add prepend domain-search to dhcp conf

Configure the DHCP client to prepend the configured domain name to the
search list in resolv.conf.
Use hostname, not IP address, for BROKER_HOST

In node.conf, set BROKER_HOST to the hostname of the broker rather than
to its IP address.
<node-manager> Proof-of-concept code for OpenShift Enterprise to scale its infrastructure.
An initial implementation uses OpenStack's nova client - others can easily be plugged in.
<nodemgr> update the docs to fix formatting issues