platforms/openstack/neutron: Revert DNS change for workers
platforms/openstack/neutron: Revert DNS change for workers

90f4d06c changed the worker DNS records to the port on the
private subnet. Reverting this change so that workers can
be accessed externally by name.

aknuds1/tectonic-installer,justaugustus/tectonic-installer,kalmog/tectonic-installer,colemickens/tectonic-installer,kyoto/tectonic-installer,s-urbaniak/tectonic-installer,squat/tectonic-installer,kyoto/tectonic-installer,mrwacky42/tectonic-installer,metral/tectonic-installer,justaugustus/tectonic-installer,kyoto/tectonic-installer,lander2k2/tectonic-installer,bsiegel/tectonic-installer,enxebre/tectonic-installer,mrwacky42/tectonic-installer,cpanato/tectonic-installer,yifan-gu/tectonic-installer,justaugustus/tectonic-installer,kyoto/tectonic-installer,enxebre/tectonic-installer,yifan-gu/tectonic-installer,bsiegel/tectonic-installer,coreos/tectonic-installer,squat/tectonic-installer,hhoover/tectonic-installer,kalmog/tectonic-installer,AduroIdeja/tectonic-installer,joshix/tectonic-installer,metral/tectonic-installer,enxebre/tectonic-installer,metral/tectonic-installer,colemickens/tectonic-installer,AduroIdeja/tectonic-installer,enxebre/tectonic-installer,coreos/tectonic-installer,zbwright/tectonic-installer,joshix/tectonic-installer,alexsomesan/tectonic-installer,hhoover/tectonic-installer,aknuds1/tectonic-installer,AduroIdeja/tectonic-installer,yifan-gu/tectonic-installer,colemickens/tectonic-installer,mrwacky42/tectonic-installer,bsiegel/tectonic-installer,alexsomesan/tectonic-installer,s-urbaniak/tectonic-installer,mrwacky42/tectonic-installer,coreos/tectonic-installer,rithujohn191/tectonic-installer,colemickens/tectonic-installer,kalmog/tectonic-installer,justaugustus/tectonic-installer,kyoto/tectonic-installer,hhoover/tectonic-installer,metral/tectonic-installer,mrwacky42/tectonic-installer,enxebre/tectonic-installer,rithujohn191/tectonic-installer,rithujohn191/tectonic-installer,zbwright/tectonic-installer,lander2k2/tectonic-installer,alexsomesan/tectonic-installer,aknuds1/tectonic-installer,aknuds1/tectonic-installer,zbwright/tectonic-installer,alexsomesan/tectonic-installer,yifan-gu/tectonic-installer,derekhiggins/installer,joshix/tectonic-installer,rithujohn191/tectonic-installer,zbwright/tectonic-installer,cpanato/tectonic-installer,derekhiggins/installer,AduroIdeja/tectonic-installer,joshix/tectonic-installer,joshix/tectonic-installer,lander2k2/tectonic-installer,coreos/tectonic-installer,s-urbaniak/tectonic-installer,s-urbaniak/tectonic-installer,coreos/tectonic-installer,metral/tectonic-installer,colemickens/tectonic-installer,cpanato/tectonic-installer,aknuds1/tectonic-installer,squat/tectonic-installer,lander2k2/tectonic-installer,alexsomesan/tectonic-installer,justaugustus/tectonic-installer,hhoover/tectonic-installer,yifan-gu/tectonic-installer,bsiegel/tectonic-installer,hhoover/tectonic-installer,AduroIdeja/tectonic-installer,squat/tectonic-installer,zbwright/tectonic-installer,rithujohn191/tectonic-installer,bsiegel/tectonic-installer,cpanato/tectonic-installer,s-urbaniak/tectonic-installer