Use wsme ClientSideError to handle unicode string
Use wsme ClientSideError to handle unicode string

We inherit from wsme.esc.ClientSideError to handle unicode string in
error message.

Fixes bug #1200518

Change-Id: I54a185a436b0a65bef13f303d7e31911cada76d8

ityaptin/ceilometer,redhat-openstack/ceilometer,fabian4/ceilometer,r-mibu/ceilometer,NeCTAR-RC/ceilometer,MisterPup/Ceilometer-Juno-Extension,mathslinux/ceilometer,isyippee/ceilometer,MisterPup/Ceilometer-Juno-Extension,maestro-hybrid-cloud/ceilometer,pczerkas/aodh,rackerlabs/instrumented-ceilometer,tanglei528/ceilometer,m1093782566/openstack_org_ceilometer,chungg/aodh,idegtiarov/ceilometer,Juniper/ceilometer,sileht/aodh,Juniper/ceilometer,cernops/ceilometer,pkilambi/ceilometer,pczerkas/aodh,froyobin/ceilometer,redhat-openstack/ceilometer,eayunstack/ceilometer,mathslinux/ceilometer,luogangyi/Ceilometer-oVirt,eayunstack/ceilometer,idegtiarov/ceilometer,NeCTAR-RC/ceilometer,tanglei528/ceilometer,tanglei528/ceilometer,NeCTAR-RC/ceilometer,maestro-hybrid-cloud/ceilometer,chungg/aodh,ityaptin/ceilometer,openstack/ceilometer,openstack/ceilometer,isyippee/ceilometer,sileht/aodh,froyobin/ceilometer,r-mibu/ceilometer,cernops/ceilometer,fabian4/ceilometer,openstack/aodh,rackerlabs/instrumented-ceilometer,m1093782566/openstack_org_ceilometer,pkilambi/ceilometer,luogangyi/Ceilometer-oVirt,openstack/aodh,rackerlabs/instrumented-ceilometer