Update python-openstackclient spec

Because all other openstack commands use 'set' instead of 'update'
as mentioned in [1] by gongysh and also in the implemetation [1],
the 'set' is used for 'openstack vim set', this patch change the
'update' to 'set' in the spec of osc commands.

This patch also update contributors based on the history of
openstack review system.

[1] https://review.openstack.org/#/c/536032/

Change-Id: I61716c48b31cfa07ed6ccd24aa3e480ff083394a
Implements: blueprint tacker-support-python-openstackclient

specs/pike/python-openstackclient.rst

@@ -78,7 +78,7 @@ VNF Commands
   openstack vnf show
 
   tacker vnf-update
-  openstack vnf update
+  openstack vnf set
 
   tacker vnfd-create
   openstack vnf descriptor create
@@ -110,7 +110,7 @@ VIM commands
   openstack vim show
 
   tacker vim-update
-  openstack vim update
+  openstack vim set
 
   tacker vim-delete
   openstack vim delete
@@ -166,7 +166,7 @@ VNFFG Commands
   openstack vnf graph show
 
   tacker vnffg-update
-  openstack vnf graph update
+  openstack vnf graph set
 
   tacker vnffgd-create
   openstack vnf graph descriptor create
@@ -245,6 +245,9 @@ Primary assignee:
   Trinath Somanchi <trinath.somanchi@nxp.com>
 
 Other contributors:
+  yong sheng gong <gong.yongsheng@99cloud.net>
+  dharmendra kushwaha <dharmendra.kushwaha@nectechnologies.in>
+  Nguyen Hai <nguyentrihai93@gmail.com>
   Srikanth Kumar Lingala <srikanth.lingala@nxp.com>
   Veera Reddy B <veera.b@nxp.com>
 
@@ -252,7 +255,7 @@ Milestones
 ----------
 
 Target Milestone for completion:
-  pike-3
+  queens-3
 
 Work Items
 ----------