Remove gawk from list of optional packages in documentation
Update PATH so that documentation btests can find bro-cut
Split dhcp log writing from record creation.

This allows users to customize dhcp.log by changing the record in their own
dhcp_ack event.
small change to documentation. In server->client messages the host name may differ from the one requested by the client.
Merge remote-tracking branch 'origin/topic/dnthayer/ticket1215'

* origin/topic/dnthayer/ticket1215:
  Update PATH so that documentation btests can find bro-cut
  Remove gawk from list of optional packages in documentation
Updating submodule(s).

 [nomail]
Merge remote-tracking branch 'origin/topic/johanna/dhcp-log'

BIT-1223 #merged

* origin/topic/johanna/dhcp-log:
  small change to documentation. In server->client messages the host name may differ from the one requested by the client.
  Split dhcp log writing from record creation.
Updating submodule(s).

 [nomail]
Fixing PATH to bro-cut in BTest configuration.