balloons: crash with AvailableResources.CPU: 0

[marquiz]

Describe the bug

cri-resmgr crashes when balloons policy is activated with AvailableResources.CPU: 0.

Expected behavior

Print an error

To Reproduce

$ cat > conf.yaml << EOF
policy:
  Active: balloons
  AvailableResources:
    CPU: 0
EOF

$ sudo ./bin/cri-resmgr --force-config conf.yaml 
I0421 14:30:55.262892 4114117 control.go:243] registering controller rdt...
...
I0421 14:30:56.284591 4114117 balloons-policy.go:135] creating balloons policy...
I0421 14:30:56.284636 4114117 http.go:171] stopping HTTP server...
panic: interface conversion: policy.Constraint is resource.Quantity, not cpuset.CPUSet

goroutine 1 [running]:
github.com/intel/cri-resource-manager/pkg/cri/resource-manager/policy/builtin/balloons.CreateBalloonsPolicy(0x33acbe0)
	/home/marquiz/go/git/cri-resource-manager/pkg/cri/resource-manager/policy/builtin/balloons/balloons-policy.go:139 +0x789
github.com/intel/cri-resource-manager/pkg/cri/resource-manager/policy.NewPolicy({0x21b86f0, 0xc000c16900}, 0xc000e3fd58)
	/home/marquiz/go/git/cri-resource-manager/pkg/cri/resource-manager/policy/policy.go:252 +0x72e
github.com/intel/cri-resource-manager/pkg/cri/resource-manager.(*resmgr).setupPolicy(0xc00015e540)
	/home/marquiz/go/git/cri-resource-manager/pkg/cri/resource-manager/resource-manager.go:453 +0x3e5
github.com/intel/cri-resource-manager/pkg/cri/resource-manager.NewResourceManager()
	/home/marquiz/go/git/cri-resource-manager/pkg/cri/resource-manager/resource-manager.go:113 +0x193
main.main()
	/home/marquiz/go/git/cri-resource-manager/cmd/cri-resmgr/main.go:83 +0x4ee

Additional context