Sync common.context changes from olso
Sync common.context changes from olso

Sync changes to common.context, to remove the dependency on the uuidutils
module that's going to be removed from oslo.

Change-Id: Ibae8af811d7f5b7d6a1499f35288073e5d383e64

supermari0/ironic,JioCloud/ironic,bacaldwell/ironic,redhat-openstack/ironic,pshchelo/ironic,faizan-barmawer/openstack_ironic,rackerlabs/ironic,ionutbalutoiu/ironic,SauloAislan/ironic,varunarya10/ironic,openstack/ironic,froyobin/ironic,devananda/ironic,NaohiroTamura/ironic,naototty/vagrant-lxc-ironic,rdo-management/ironic,ramineni/myironic,naterh/ironic,Tehsmash/ironic,dims/ironic,naototty/vagrant-lxc-ironic,debayanray/ironic_backup,dims/ironic,bacaldwell/ironic,NaohiroTamura/ironic,Tan0/ironic,hpproliant/ironic,SauloAislan/ironic,ionutbalutoiu/ironic,pshchelo/ironic,openstack/ironic