removed wrap_exception method from ironic/common/exception.py
removed wrap_exception method from ironic/common/exception.py

method wrap_exception was never used

Closes-Bug: #1250533

Change-Id: I02227a65e5f37a8bd93e6d53f31f28f5633ab8c5

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