Port location tracking for BigSwitch Plugin

Adds a new table to the Big Switch plugin to keep track of
the nova compute node host IDs that ports reside on.
This table is then used to allow users to override
the VIF type for a compute node based on the host ID.
This allows quantum to control an environment with multiple
VIF types.

Change-Id: I63eb66d970650237aed2d5dc6676a6d097988f8d
Implements: blueprint hostid-vif-override
Use 0.0.0.0/0 host route as router option

There is a currently a hacky way to get the dhcp-agent to hand out a
gateway route using a host route on the subnet. If you pass a route
that has 0.0.0.0/0 as its destination, dnsmasq will pass it as a static
route. Unfortunately it will also pass the router option if the subnet
has a gateway set. This is inconsistent and precludes users from options
that are available in nova-network like using an external gateway.

This patch fixes things by allowing a 0.0.0.0/0 host route to override
the router setting passed by dnsmasq. This prevents the situation
where dnsmasq hands out two default routes.

Change-Id: Ia70223070bfd437f1c2eb48fde94491d7ee61fcb
Ensure that the report state is not a blocking call

Fixes bug 1191768

For the dhcp and l3 agents the first state report will be done
via a call. If this succeeds then subsequent calls will be done via
the cast method.

Change-Id: I82a1d92fc84983b7bb46758db0aee3e3eca1d3be
Merge "Use 0.0.0.0/0 host route as router option"
Remove reference to quantum cli in provider network extension

We don't need this info in the doc string as it is already in the admin
guide. If the CLI changes then we'll also have to update the doc string.

Fixes bug 1195429

Change-Id: If27788477c886f6faedbc5fca7856b683a6953f1
move database config items into quantum.conf

Bug #1194784

This patch syncs all the DB configuration items into
quantum.conf and removes the related items of plugins' config
file to avoid duplication.

sqlite related sqlite_db and sqlite_synchronous are defined
in 'default' section, which I think is a defect. And it seems
quantum does not use sqlite_db item.

Change-Id: Ia47102ced0e4169f45f10b85311f298d8c026d31
Merge "Port location tracking for BigSwitch Plugin"
Merge "Ensure that the report state is not a blocking call"