Rename "preferred" kernel to "default" kernel

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

internal/pkg/kernel/kernel.go

@@ -44,7 +44,7 @@ func (k collection) Sort() {
 	sort.Sort(k)
 }
 
-func (k collection) Preferred() *Kernel {
+func (k collection) Default() *Kernel {
 	nk := append(collection{}, k...)
 	sort.Sort(sort.Reverse(nk))
 	for _, kernel := range nk {
@@ -83,7 +83,7 @@ func FromNode(node *node.Node) *Kernel {
 			return FindKernels(node.ContainerName).Version(node.Kernel.Version)
 		}
 	} else {
-		return FindKernels(node.ContainerName).Preferred()
+		return FindKernels(node.ContainerName).Default()
 	}
 }
 

internal/pkg/kernel/kernel_test.go

@@ -96,7 +96,7 @@ func Test_FindKernel(t *testing.T) {
 
 			kernels := FindKernels("testcontainer")
 			assert.Equal(t, len(tt.files), len(kernels))
-			kernel := kernels.Preferred()
+			kernel := kernels.Default()
 			if tt.version == "" && tt.path == "" {
 				assert.Nil(t, kernel)
 			} else {