MFC:

• Add HCI node autodetection. As a consequence of this, make the '-n' parameter optional.
• Add Read_Node_List command which prints a list of available HCI nodes, their Netgraph IDs and connected hooks

Revisions:
hccontrol.h rev. 1.6
hccontrol.c rev. 1.4 + 1.5
node.c rev. 1.4

Approved by: emax (mentor)