Only update PVS_proxy.state if OVS rules are present
Only update PVS_proxy.state if OVS rules are present

This avoids a possibly confusing situation where `currently_attached=false`
(OVS rules absent), but the RRD plugin still reports that the VM is cached, and
`state` is set to `caching`.

Signed-off-by: Rob Hoes <8783b3376fb07d39edffc8d7da68a6de3874a7e6@citrix.com>

srowe/xen-api,Frezzle/xen-api,Frezzle/xen-api,Frezzle/xen-api,srowe/xen-api,euanh/xen-api,srowe/xen-api,thomassa/xen-api,euanh/xen-api,thomassa/xen-api,thomassa/xen-api,thomassa/xen-api,Frezzle/xen-api,srowe/xen-api,euanh/xen-api,Frezzle/xen-api,thomassa/xen-api,euanh/xen-api,euanh/xen-api,thomassa/xen-api,euanh/xen-api,srowe/xen-api