Make the multi-select button on the "Floating IPs" page work again
Make the multi-select button on the "Floating IPs" page work again

This was a result of an assumption made by table-sorter.js, which
was parroted by Horizon; that there will only be one row of table
headers in a <thead> section.  Horizon uses two rows: one for the
"table title" and one for the individual table headings.

With the default settings to tablesorter(), this yielded an off-by-one
error when applying custom sorters (or parsers, depending on which
nomenclature you like, table-sorter.js uses two) to the table.

it is only tickled when manually defining custom parsers for columns,
and has been known about for a while, as there was code to compensate
for the observed behaviour.

Altering the xpath to omit the extra headers (and telling tablesorter
to do the same) yields the expected results.  I would personally
prefer to chain the results through .not(), but tablesorter only
provides support for xpath

Change-Id: I3338dd0cafd8271de6bf5d980359ed62c752ed98
Fixes: Bug 1186914

BiznetGIO/horizon,bigswitch/horizon,redhat-openstack/horizon,tanglei528/horizon,FNST-OpenStack/horizon,liyitest/rr,ChameleonCloud/horizon,flochaz/horizon,Mirantis/mos-horizon,Solinea/horizon,VaneCloud/horizon,izadorozhna/dashboard_integration_tests,openstack-ja/horizon,agileblaze/OpenStackTwoFactorAuthentication,tsufiev/horizon,promptworks/horizon,NeCTAR-RC/horizon,bigswitch/horizon,bac/horizon,BiznetGIO/horizon,NeCTAR-RC/horizon,endorphinl/horizon-fork,Solinea/horizon,takeshineshiro/horizon,luhanhan/horizon,openstack/horizon,tuskar/tuskar-ui,xme1226/horizon,yeming233/horizon,bigswitch/horizon,vladryk/horizon,anthonydillon/horizon,spring-week-topos/horizon-week,aaronorosen/horizon-congress,newrocknj/horizon,redhat-cip/horizon,Tesora/tesora-horizon,mrunge/openstack_horizon,idjaw/horizon,pranavtendolkr/horizon,django-leonardo/horizon,CiscoSystems/horizon,saydulk/horizon,wolverineav/horizon,tsufiev/horizon,openstack-ja/horizon,philoniare/horizon,j4/horizon,kfox1111/horizon,kaiweifan/horizon,xme1226/horizon,xinwu/horizon,JioCloud/horizon,redhat-cip/horizon,agileblaze/OpenStackTwoFactorAuthentication,doug-fish/horizon,henaras/horizon,rdo-management/tuskar-ui,dan1/horizon-proto,maestro-hybrid-cloud/horizon,davidcusatis/horizon,django-leonardo/horizon,redhat-openstack/horizon,Solinea/horizon,dan1/horizon-proto,gochist/horizon,kfox1111/horizon,karthik-suresh/horizon,idjaw/horizon,philoniare/horizon,Daniex/horizon,bac/horizon,Daniex/horizon,promptworks/horizon,CiscoSystems/horizon,dan1/horizon-x509,tanglei528/horizon,yanheven/console,takeshineshiro/horizon,damien-dg/horizon,henaras/horizon,pranavtendolkr/horizon,BiznetGIO/horizon,openstack/horizon,dan1/horizon-x509,wangxiangyu/horizon,Hodorable/0602,idjaw/horizon,rdo-management/tuskar-ui,endorphinl/horizon,pranavtendolkr/horizon,Tesora/tesora-horizon,tuskar/tuskar-ui,CiscoSystems/avos,VaneCloud/horizon,Daniex/horizon,Metaswitch/horizon,ikargis/horizon_fod,luhanhan/horizon,orbitfp7/horizon,spring-week-topos/horizon-week,Mirantis/mos-horizon,tuskar/tuskar-ui,openstack/horizon,mrunge/horizon,wangxiangyu/horizon,NCI-Cloud/horizon,redhat-cip/horizon,mrunge/horizon_lib,Metaswitch/horizon,gochist/horizon,newrocknj/horizon,henaras/horizon,gerrive/horizon,j4/horizon,wolverineav/horizon,yeming233/horizon,RudoCris/horizon,saydulk/horizon,nvoron23/avos,yeming233/horizon,endorphinl/horizon-fork,FNST-OpenStack/horizon,ChameleonCloud/horizon,kaiweifan/horizon,nvoron23/avos,watonyweng/horizon,izadorozhna/dashboard_integration_tests,zouyapeng/horizon,NCI-Cloud/horizon,CiscoSystems/avos,JioCloud/horizon,NCI-Cloud/horizon,mrunge/openstack_horizon,damien-dg/horizon,noironetworks/horizon,zouyapeng/horizon,mandeepdhami/horizon,flochaz/horizon,mdavid/horizon,dan1/horizon-x509,tanglei528/horizon,NCI-Cloud/horizon,ChameleonCloud/horizon,openstack-ja/horizon,vladryk/horizon,Metaswitch/horizon,endorphinl/horizon-fork,newrocknj/horizon,yjxtogo/horizon,sandvine/horizon,tqtran7/horizon,liyitest/rr,rdo-management/tuskar-ui,blueboxgroup/horizon,RudoCris/horizon,karthik-suresh/horizon,kfox1111/horizon,CiscoSystems/horizon,karthik-suresh/horizon,mandeepdhami/horizon,ikargis/horizon_fod,philoniare/horizon,anthonydillon/horizon,tqtran7/horizon,yjxtogo/horizon,Dark-Hacker/horizon,dan1/horizon-x509,JioCloud/horizon,tellesnobrega/horizon,maestro-hybrid-cloud/horizon,bac/horizon,j4/horizon,zouyapeng/horizon,yjxtogo/horizon,mdavid/horizon,aaronorosen/horizon-congress,wolverineav/horizon,mrunge/horizon,noironetworks/horizon,doug-fish/horizon,mrunge/horizon,zouyapeng/horizon,ChameleonCloud/horizon,blueboxgroup/horizon,damien-dg/horizon,icloudrnd/automation_tools,maestro-hybrid-cloud/horizon,froyobin/horizon,pranavtendolkr/horizon,damien-dg/horizon,RudoCris/horizon,orbitfp7/horizon,xinwu/horizon,r-icarus/openstack_microserver,VaneCloud/horizon,orbitfp7/horizon,spring-week-topos/horizon-week,froyobin/horizon,anthonydillon/horizon,karthik-suresh/horizon,tellesnobrega/horizon,tsufiev/horizon,NeCTAR-RC/horizon,CiscoSystems/avos,ging/horizon,mrunge/openstack_horizon,rickerc/horizon_audit,VaneCloud/horizon,vladryk/horizon,kfox1111/horizon,Hodorable/0602,dan1/horizon-proto,endorphinl/horizon,bac/horizon,citrix-openstack-build/horizon,watonyweng/horizon,flochaz/horizon,redhat-openstack/horizon,icloudrnd/automation_tools,aaronorosen/horizon-congress,endorphinl/horizon,flochaz/horizon,saydulk/horizon,icloudrnd/automation_tools,tqtran7/horizon,r-icarus/openstack_microserver,mrunge/horizon_lib,r-icarus/openstack_microserver,mandeepdhami/horizon,agileblaze/OpenStackTwoFactorAuthentication,Daniex/horizon,luhanhan/horizon,RudoCris/horizon,Hodorable/0602,froyobin/horizon,yjxtogo/horizon,gerrive/horizon,xinwu/horizon,django-leonardo/horizon,doug-fish/horizon,FNST-OpenStack/horizon,Dark-Hacker/horizon,yanheven/console,ging/horizon,Metaswitch/horizon,FNST-OpenStack/horizon,Mirantis/mos-horizon,Dark-Hacker/horizon,tsufiev/horizon,luhanhan/horizon,tellesnobrega/horizon,ging/horizon,endorphinl/horizon-fork,wolverineav/horizon,yeming233/horizon,nvoron23/avos,kaiweifan/horizon,CiscoSystems/avos,anthonydillon/horizon,coreycb/horizon,doug-fish/horizon,eayunstack/horizon,tqtran7/horizon,noironetworks/horizon,xme1226/horizon,redhat-openstack/horizon,gerrive/horizon,sandvine/horizon,davidcusatis/horizon,saydulk/horizon,watonyweng/horizon,idjaw/horizon,openstack/horizon,coreycb/horizon,coreycb/horizon,Hodorable/0602,mdavid/horizon,henaras/horizon,sandvine/horizon,noironetworks/horizon,promptworks/horizon,orbitfp7/horizon,blueboxgroup/horizon,CiscoSystems/horizon,mdavid/horizon,ging/horizon,xinwu/horizon,NeCTAR-RC/horizon,tellesnobrega/horizon,sandvine/horizon,yanheven/console,vladryk/horizon,promptworks/horizon,wangxiangyu/horizon,Tesora/tesora-horizon,davidcusatis/horizon,blueboxgroup/horizon,liyitest/rr,Dark-Hacker/horizon,citrix-openstack-build/horizon,Tesora/tesora-horizon,netscaler/horizon,liyitest/rr,dan1/horizon-proto,eayunstack/horizon,davidcusatis/horizon,netscaler/horizon,netscaler/horizon,newrocknj/horizon,watonyweng/horizon,gochist/horizon,rdo-management/tuskar-ui,coreycb/horizon,redhat-cip/horizon,j4/horizon,mandeepdhami/horizon,django-leonardo/horizon,endorphinl/horizon,gerrive/horizon,takeshineshiro/horizon,Solinea/horizon,mrunge/horizon_lib,rickerc/horizon_audit,Mirantis/mos-horizon,philoniare/horizon,wangxiangyu/horizon,rickerc/horizon_audit,ikargis/horizon_fod,takeshineshiro/horizon,bigswitch/horizon,maestro-hybrid-cloud/horizon,nvoron23/avos,agileblaze/OpenStackTwoFactorAuthentication,icloudrnd/automation_tools,BiznetGIO/horizon,citrix-openstack-build/horizon,eayunstack/horizon