Add *.swo/swp to .gitignore
Add *.swo/swp to .gitignore

I noticed these files weren't being ignored when I accidentally uploaded
one here: https://review.openstack.org/#/c/30648/3

Fixes bug: 1187600

Change-Id: I8570f797e2cc7420dc8a578a9cf68741631cd9f6

CiscoSystems/networking-cisco,openstack/networking-cisco,noironetworks/networking-cisco,hareeshpc/networking-cisco,Gitweijie/first_project,Tehsmash/networking-cisco,hareeshpc/networking-cisco,Tehsmash/networking-cisco-apic,cisco-openstack/networking-cisco,Tehsmash/networking-cisco-nexus,nikolay-fedotov/networking-cisco,CiscoSystems/networking-cisco,Gitweijie/first_project,cisco-openstack/networking-cisco,openstack/networking-cisco,Tehsmash/networking-cisco,noironetworks/networking-cisco