Implement "address scope create" command

This patch supports creating a new address scope,
with --ip-version,--project,--project-domain
and --share or --no-share options.

Change-Id: I37c73391a41ac239dd72d55dbc0adbebd7701f4a
Partial-Bug: #1566269

doc/source/command-objects/address-scope.rst

@@ -0,0 +1,48 @@
+=============
+address scope
+=============
+
+An **address scope** is a scope of IPv4 or IPv6 addresses that belongs
+to a given project and may be shared between projects.
+
+Network v2
+
+address scope create
+--------------------
+
+Create new address scope
+
+.. program:: address scope create
+.. code:: bash
+
+    os address scope create
+        [--project <project> [--project-domain <project-domain>]]
+        [--ip-version <ip-version>]
+        [--share | --no-share]
+        <name>
+
+.. option:: --project <project>
+
+    Owner's project (name or ID)
+
+.. option:: --project-domain <project-domain>
+
+    Domain the project belongs to (name or ID).
+    This can be used in case collisions between project names exist.
+
+.. option:: --ip-version <ip-version>
+
+    IP version (4 or 6, default is 4)
+
+.. option:: --share
+
+    Share the address scope between projects
+
+.. option:: --no-share
+
+    Do not share the address scope between projects (default)
+
+.. _address_scope_create-name:
+.. describe:: <name>
+
+     New address scope name

doc/source/commands.rst

@@ -70,6 +70,7 @@ the API resources will be merged, as in the ``quota`` object that has options
 referring to both Compute and Volume quotas.
 
 * ``access token``: (**Identity**) long-lived OAuth-based token
+* ``address scope``: (**Network**) a scope of IPv4 or IPv6 addresses
 * ``aggregate``: (**Compute**) a grouping of compute hosts
 * ``availability zone``: (**Compute**, **Network**, **Volume**) a logical partition of hosts or block storage or network services
 * ``backup``: (**Volume**) a volume copy