Remove table search placeholder overwrite
Remove table search placeholder overwrite

Currently, the table-header-template sets the placeholder for filter
inputs.  This value is also being set (overwritten really) by
horizon.forms.js .  That doesn't make any sense.  Gabriel had previously
added a FIXME for this issue, but when it was fixed, nobody removed the
js overwrite.

The template placeholder is here (currently)
https://github.com/openstack/horizon/blob/master/horizon/templates/horizon/common/_data_table_table_actions.html#L21

Change-Id: Ib9ee07ef9db546aa48c8d235c2eecc82364dd4d4
Partially-implements: blueprint horizon-theme-css-reorg

django-leonardo/horizon,BiznetGIO/horizon,yeming233/horizon,django-leonardo/horizon,davidcusatis/horizon,openstack/horizon,BiznetGIO/horizon,Mirantis/mos-horizon,NeCTAR-RC/horizon,noironetworks/horizon,bigswitch/horizon,coreycb/horizon,coreycb/horizon,sandvine/horizon,NeCTAR-RC/horizon,sandvine/horizon,redhat-openstack/horizon,dan1/horizon-x509,ChameleonCloud/horizon,gerrive/horizon,davidcusatis/horizon,bac/horizon,davidcusatis/horizon,sandvine/horizon,noironetworks/horizon,wolverineav/horizon,dan1/horizon-x509,redhat-openstack/horizon,coreycb/horizon,django-leonardo/horizon,coreycb/horizon,ChameleonCloud/horizon,sandvine/horizon,redhat-openstack/horizon,dan1/horizon-x509,bigswitch/horizon,davidcusatis/horizon,bac/horizon,wolverineav/horizon,yeming233/horizon,openstack/horizon,wolverineav/horizon,bigswitch/horizon,gerrive/horizon,redhat-openstack/horizon,gerrive/horizon,Mirantis/mos-horizon,noironetworks/horizon,Mirantis/mos-horizon,gerrive/horizon,openstack/horizon,ChameleonCloud/horizon,yeming233/horizon,ChameleonCloud/horizon,noironetworks/horizon,bac/horizon,BiznetGIO/horizon,dan1/horizon-x509,bigswitch/horizon,wolverineav/horizon,NeCTAR-RC/horizon,Mirantis/mos-horizon,NeCTAR-RC/horizon,yeming233/horizon,django-leonardo/horizon,bac/horizon,BiznetGIO/horizon,openstack/horizon