localrc default should not require editing to work

Previous commits enabled VirtualPowerManager, but only if the user
edited the localrc to supply the user/pass.

This commit makes localrc default to use FakePowerManager, rather
than error if the user does not edit it.

If the user wants to use VirtualPowerManager, they must uncomment a
section and edit the user/pass options. This is more clearly stated
now in the in-line comment.
Update notes.md for several things.

- bm_poseur creates baremetal nodes with only 1 NIC
- populate-nova-bm-db no longer requires -j option
- localrc defaults to FakePowerManager
- localrc can be edited to enable VirtualPowerManager