Better handling of stale tokens (no more 401's)
Better handling of stale tokens (no more 401's)

There was a problem with stale tokens generating 401's. The
headers for the request where not replacing the stale token
with the freshly obtained one. This patch remedies that.

Change-Id: I8e7c7e01fddeec17ad9ff4254b1223820bb8e2b7

ntt-sic/python-novaclient,CCI-MOC/python-novaclient,citrix-openstack-build/python-novaclient,guptaankita/python-novaclient,metacloud/python-novaclient,takeshineshiro/python-novaclient,akash1808/python-novaclient,Shihta/python-novaclient,mat128/python-novaclient,JioCloud/python-novaclient,guptaankita/python-novaclient,Shihta/python-novaclient,JioCloud/python-novaclient,ntt-sic/python-novaclient,citrix-openstack-build/python-novaclient,mat128/python-novaclient,takeshineshiro/python-novaclient,metacloud/python-novaclient,CCI-MOC/python-novaclient,akash1808/python-novaclient