Refactor DataTable filtering functions into mixin
Refactor DataTable filtering functions into mixin

Move DataTable filtering related functions into MultiTableMixin so
that all classes using it can have filtering in their tables.

Change-Id: Ia3942e4f639393ccf2f8659279492d605972b971

sandvine/horizon,ChameleonCloud/horizon,wolverineav/horizon,openstack/horizon,noironetworks/horizon,sandvine/horizon,Mirantis/mos-horizon,noironetworks/horizon,bac/horizon,yeming233/horizon,coreycb/horizon,sandvine/horizon,openstack/horizon,NeCTAR-RC/horizon,bigswitch/horizon,yeming233/horizon,coreycb/horizon,bigswitch/horizon,wolverineav/horizon,NeCTAR-RC/horizon,sandvine/horizon,bac/horizon,bigswitch/horizon,BiznetGIO/horizon,Mirantis/mos-horizon,Mirantis/mos-horizon,ChameleonCloud/horizon,bac/horizon,bac/horizon,ChameleonCloud/horizon,wolverineav/horizon,Mirantis/mos-horizon,ChameleonCloud/horizon,noironetworks/horizon,openstack/horizon,NeCTAR-RC/horizon,noironetworks/horizon,NeCTAR-RC/horizon,bigswitch/horizon,BiznetGIO/horizon,BiznetGIO/horizon,BiznetGIO/horizon,openstack/horizon,yeming233/horizon,wolverineav/horizon,coreycb/horizon,yeming233/horizon,coreycb/horizon