Make sure reboot_instance uses updated instance

compute manager's reboot_instance() was doing a check on a stale version
of instance['power_state'] as well as passing stale instance data to the
driver and notification calls.

Fixes bug 1098727

Change-Id: I59f12f09d6e8a364e65f53912c09132a249c88c0
Renames the new os-networks extension

Merging the new os-networks extension upstream broke what was considered
a 'released' extension. This patch returns everything to normal and
renames the os-networks extension to os-tenant-networks

DocImpact

Implements: blueprint tenant-networks

Change-Id: I04b17d08c5760fd73736124b36cab0d383767020
Merge "Renames the new os-networks extension"
Merge "Make sure reboot_instance uses updated instance"