lib/ovs: add constants for ovsdb Open_vSwitch db

Those constants are used to manipulate Open_vSwitch db of ovsdb.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
lib/ovs/vsctl: python reimplementation of ovs-vsctl

This implements subset of ovs-vsctl which is used later.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
lib/ovs/bridge: helper class to manipulate ovs bridge

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
replace dispatcher mechanism

This is purely internal change and no API for applications is
changed. At least, I confirmed that folsom OpenStack plugin works.

With the current dispatcher mechanism, multiple greenlets call
applications' handlers and might be blocked anywhere so we need
various locks to handle that concurrency. This makes things difficult
for application developers.

With this patch, each applications are connected with events. Each
application has the own greenlet(s) to handle events and might send
events to other applications.

If an application registers handlers for some OF events, it subscribes
to OF component and registers the OF events that it's interested. OF
application delivers such OF events to the application and the
application's greenlet executes the handlers.

With this, we can completely remove dispatcher.py and its friends.

Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
app/rest: add requirements to path component

This patch adds requirements to path component so that URL is verified.
And simplify with submapper.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
app/rest_nw_id: add port type for reserved port and vport-gre

This patch adds new port type for reserved port and vport-gre.
They will be used later. Via this REST API, ryu knows which port is used
for gre or reserved port.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
ryu/app/client: factor out rest client code

REST API will be enhanced. So factor out reset client code such that
it affords extension.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
app/client: add helper function to ignore NOT_FOUND, 404

Sometimes client code just wants to ignore 404 when deleting resources.
So provide helper function for it.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
bin/ryu-manager: import ryu.flags for common options

Otherwise those options can't be specified.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>