added two rules in .gitignore for ingoring files necessary for the credentials for adding the GCE and KVM via libvirt backends
added two rules in .gitignore for ingoring files necessary for the credentials for adding the GCE and KVM via libvirt backends

afivos/mist.io,Lao-liu/mist.io,Lao-liu/mist.io,munkiat/mist.io,DimensionDataCBUSydney/mist.io,DimensionDataCBUSydney/mist.io,DimensionDataCBUSydney/mist.io,munkiat/mist.io,johnnyWalnut/mist.io,afivos/mist.io,Lao-liu/mist.io,munkiat/mist.io,johnnyWalnut/mist.io,DimensionDataCBUSydney/mist.io,afivos/mist.io,johnnyWalnut/mist.io,Lao-liu/mist.io,munkiat/mist.io