Adding weight column to Neutron lb member list CLI

Adding 'weight' column to lbaas member-list command in order to quickly
identify member properties. Protocol port was already been shown.
This avoids having to enter each member details to see the weights
settings.

Change-Id: Id3c8cd8b3304535e2d82777018121007ed3bb129
Closes-Bug: #1267575
Add shared parameter for metering labels

With this patch metering labels can
be set as shared so that the rules
associated with this label will be
applied to all routers for all tenants.

Partially implements
blueprint l3-metering-mgnt-ext

Change-Id: I23f9fb9cf17c7a20069616bb1c4ae19a5dc55d68
Fix net-gateway-create help message

"neutron help net-gateway-create" said:

  --device DEVICE Device info for this gateway device_id=<deviceidentifier>...

However, actually parameter name of DEVICE is "id". Not "device_id".

Change-Id: Ifa19f11f250101ddf4803c3c591bb19274fae869
Closes-Bug: #1262527
Merge "Add shared parameter for metering labels"
Merge "Adding weight column to Neutron lb member list CLI"
Merge "Fix net-gateway-create help message"