Fix bug in CPUManager map.Keys() and map.Values() implementations

Previously these would return lists that were too long because we appended to
pre-initialized lists with a specific size.

Since the primary place these functions are used is in the mean and standard
deviation calculations for the NUMA distribution algorithm, it meant that the
results of these calculations were often incorrect.

As a result, some of the unit tests we have are actually incorrect (because the
results we expect do not actually produce the best balanced
distribution of CPUs across all NUMA nodes for the input provided).

These tests will be patched up in subsequent commits.

Signed-off-by: Kevin Klues <kklues@nvidia.com>

pkg/kubelet/cm/cpumanager/cpu_assignment.go

@@ -45,7 +45,7 @@ func (m mapIntInt) Clone() mapIntInt {
 }
 
 func (m mapIntInt) Keys() []int {
-	keys := make([]int, len(m))
+	var keys []int
 	for k := range m {
 		keys = append(keys, k)
 	}
@@ -53,7 +53,7 @@ func (m mapIntInt) Keys() []int {
 }
 
 func (m mapIntInt) Values() []int {
-	values := make([]int, len(m))
+	var values []int
 	for _, v := range m {
 		values = append(values, v)
 	}