Disable dhcp_domain distribution when dhcp_domain is empty

fixes bug 1099625

Change-Id: Ib86770345c46a0dd8bb38a4c3e435420170828af
Enable OVS and NETNS utilities to perform logging

Fixes bug 1118517

Change-Id: I041e61505475da2383b34eaeb16dd3b0e9750898
Merge "Enable OVS and NETNS utilities to perform logging" into stable/folsom
Shorten the DHCP default resync_interval

Fixes bug 1128180

Change-Id: Ie63ef674b5e05fab659e675774a1b25cd57d4c41
Merge "Disable dhcp_domain distribution when dhcp_domain is empty" into stable/folsom
Merge "Shorten the DHCP default resync_interval" into stable/folsom