Fixes DHCP Client Settings

Previously, broker and node servers would revert to hostname
settings after reboot due to upstream DHCP Server behavior.

The DNS server information in /etc/resolv.conf would default back
the server returned from your DHCP server on the next boot of the
server.

This patch configures a /etc/dhcp/dhclient-\{$network device}.conf
file to supersede the default behavior.
Merge pull request #178 from danehans/fix_dhcp_client

Fixes DHCP Client Settings
Add function to automatically wrap rhc calls with SCL
Merge pull request #181 from nhr/rhc_wrapper

Add function to automatically wrap rhc calls with SCL
Revise rhc wrapper to pass all args through function
Merge pull request #182 from nhr/rhc_fix2

Revise rhc wrapper to pass all args through function