metadata: relocation.inc: add whitespace around assignments

With:
https://lists.openembedded.org/g/bitbake-devel/message/17508
there are many WARNINGs from this layer

Signed-off-by: Martin Jansa <martin.jansa@gmail.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

recipes-containers/docker-compose/relocation.inc

@@ -1,4 +1,4 @@
-export sites="k8s.io/api:k8s.io/api:force \
+export sites = "k8s.io/api:k8s.io/api:force \
            k8s.io/utils:k8s.io/utils:force \
            k8s.io/klog/v2:k8s.io/klog/v2:force \
            gotest.tools/v3:gotest.tools/v3:force \

recipes-containers/k3s/relocation.inc

@@ -1,4 +1,4 @@
-export sites="k8s.io/utils:k8s.io/utils:force \
+export sites = "k8s.io/utils:k8s.io/utils:force \
            cel.dev/expr:cel.dev/expr:force \
            k8s.io/gengo:k8s.io/gengo:force \
            go.uber.org/fx:go.uber.org/fx:force \

recipes-containers/nerdctl/relocation.inc

@@ -1,4 +1,4 @@
-export sites="gotest.tools/v3:gotest.tools/v3:force \
+export sites = "gotest.tools/v3:gotest.tools/v3:force \
            go.uber.org/mock:go.uber.org/mock:force \
            golang.org/x/net:golang.org/x/net:force \
            golang.org/x/sys:golang.org/x/sys:force \

recipes-extended/rootlesskit/relocation.inc

@@ -1,4 +1,4 @@
-export sites="gotest.tools/v3:gotest.tools/v3:force \
+export sites = "gotest.tools/v3:gotest.tools/v3:force \
            golang.org/x/sys:golang.org/x/sys:force \
            golang.org/x/net:golang.org/x/net:force \
            github.com/gofrs/flock:github.com/gofrs/flock:force \

recipes-networking/cni/relocation.inc

@@ -1,4 +1,4 @@
-export sites="golang.org/x/exp:golang.org/x/exp:force \
+export sites = "golang.org/x/exp:golang.org/x/exp:force \
            golang.org/x/net:golang.org/x/net:force \
            golang.org/x/sys:golang.org/x/sys:force \
            gopkg.in/yaml.v3:gopkg.in/yaml.v3:force \