vpc egress gateway: set minimum replicas to zero (#5235)

Signed-off-by: zhangzujian <zhangzujian.7@gmail.com>

Author: zhangzujian

charts/kube-ovn-v2/crds/kube-ovn-crd.yaml

@@ -979,7 +979,7 @@ spec:
                 replicas:
                   type: integer
                   default: 1
-                  minimum: 1
+                  minimum: 0
                   maximum: 10
                 prefix:
                   type: string

charts/kube-ovn/templates/kube-ovn-crd.yaml

@@ -992,7 +992,7 @@ spec:
                   type: integer
                   format: int32
                   default: 1
-                  minimum: 1
+                  minimum: 0
                   maximum: 10
                 prefix:
                   type: string

dist/images/install.sh

@@ -1230,7 +1230,7 @@ spec:
                   type: integer
                   format: int32
                   default: 1
-                  minimum: 1
+                  minimum: 0
                   maximum: 10
                 prefix:
                   type: string