Support configdrive in agent driver

This passes the configdrive URL to the agent, to be downloaded
and written to a partition during deployment.

Implements: blueprint expose-configdrive

Change-Id: I3d142acb76a87d92a3f7b0be039c157cda4a7aa8
Add serial console feature to seamicro driver

Implements a console driver -- "ShellinaboxConsole" -- that uses
telnet+shellinabox to connect to serial console of physical servers
configured within the Seamicro Fabric Compute system.

SeaMicro System provides telnet facility to connect to any of
it's physical server's serial console. Port to which we telnet
depends on server-id.

Change-Id: I2e60f6402a984dbbb6e0f749729c5a7006310076
Implements: blueprint seamicro-serial-console
Minor fix to install guide for associating k&r to nodes

Improve the install guide's instructions for associating a deploy kernel
& ramdisk to a node, rather than creating a new node.

Change-Id: Ibfbe805e5b762e6d146ffc50514fa7d6f3ebebe4
Correct link in user guide

The user guide was referencing the old Baremetal wiki page.
This has been corrected to reference Ironic's wiki instead.

Change-Id: I1a725e0f8ebafc1ac3c80b0976ccc3c3312416f6
Merge "Support configdrive in agent driver"
Merge "Add serial console feature to seamicro driver"
Merge "Minor fix to install guide for associating k&r to nodes"
Merge "Correct link in user guide"