fix typo for specs/kubernetes-deployment.rst, tools/ovs-dpdkctl.sh, tools/setup_gate.sh

'managment' -> 'management'
'seperated' -> 'separated'
'occuring' -> 'occurring'
'discribed' -> 'described'
'recomended' -> 'recommended'
'thier' -> 'their'

Change-Id: Ie59c600698c965cebd9a541b951d704eda9301cb