devbridge: improve locking, unbind ports automatically on read error and more...

Use an RWlock so readers can work in parallel in
the common case (no cache updates).

When a reader needs to update the cache to add
a new learned source mac address, it will drop
the rlock and aquire the wlock to do the update.

When we get a read error, we now unbind the
port to avoid further packets being forwarded
to it.

This is usefull for hotplug ethernet devices
like usb ones or tunnels.

Simplify the unbind, getting rid of the refcount,
by having only the reader proc call freeport().

Avoid holding the bridge lock while opening
and closing ethernet/tunnel device files during
bind and unbind.

Dont use smalloc() (especially when holding locks).

Allocate bridges dynamically, so we do not waste
the memory when we do not need them.

Reject non-hostowner from allocating new bridges.

Use consistent naming: port -> port

Use consistent comment style: // -> /* */

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