Removed duplicated function to create a swap fs
Removed duplicated function to create a swap fs

The mkfs() function in common/utils.py already can be used to create
a swap fs on a device, so there's no need to create another one in the
deploy_utils.py file.

Change-Id: I0e1983d53b43d69b350cff462e975984ce2d86c9

froyobin/ironic,redhat-openstack/ironic,ramineni/myironic,rackerlabs/ironic,naterh/ironic,supermari0/ironic,SauloAislan/ironic,faizan-barmawer/openstack_ironic,Tehsmash/ironic,openstack/ironic,bacaldwell/ironic,ionutbalutoiu/ironic,rdo-management/ironic,devananda/ironic,JioCloud/ironic,hpproliant/ironic,dims/ironic,NaohiroTamura/ironic,pshchelo/ironic,SauloAislan/ironic,dims/ironic,ionutbalutoiu/ironic,openstack/ironic,debayanray/ironic_backup,bacaldwell/ironic,naototty/vagrant-lxc-ironic,varunarya10/ironic,naototty/vagrant-lxc-ironic,Tan0/ironic,NaohiroTamura/ironic,pshchelo/ironic