Address Checkstyle violations
diff --git a/openstack-neutron/src/main/java/org/jclouds/openstack/neutron/v2/domain/Network.java b/openstack-neutron/src/main/java/org/jclouds/openstack/neutron/v2/domain/Network.java
index 1710e9c..a88def7 100644
--- a/openstack-neutron/src/main/java/org/jclouds/openstack/neutron/v2/domain/Network.java
+++ b/openstack-neutron/src/main/java/org/jclouds/openstack/neutron/v2/domain/Network.java
@@ -25,7 +25,6 @@
 
 import javax.inject.Named;
 import java.beans.ConstructorProperties;
-import java.util.Set;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
@@ -381,7 +380,7 @@
       return new UpdateBuilder();
    }
 
-   private static abstract class Builder<ParameterizedBuilderType> {
+   private abstract static class Builder<ParameterizedBuilderType> {
       protected Network network;
 
       /**
diff --git a/openstack-neutron/src/main/java/org/jclouds/openstack/neutron/v2/domain/Port.java b/openstack-neutron/src/main/java/org/jclouds/openstack/neutron/v2/domain/Port.java
index b8ebf0e..265a496 100644
--- a/openstack-neutron/src/main/java/org/jclouds/openstack/neutron/v2/domain/Port.java
+++ b/openstack-neutron/src/main/java/org/jclouds/openstack/neutron/v2/domain/Port.java
@@ -473,7 +473,7 @@
       return new UpdateBuilder();
    }
 
-   private static abstract class Builder<ParameterizedBuilderType> {
+   private abstract static class Builder<ParameterizedBuilderType> {
       protected Port port;
 
       /**
diff --git a/openstack-neutron/src/main/java/org/jclouds/openstack/neutron/v2/domain/Router.java b/openstack-neutron/src/main/java/org/jclouds/openstack/neutron/v2/domain/Router.java
index 48143f6..150e2b8 100644
--- a/openstack-neutron/src/main/java/org/jclouds/openstack/neutron/v2/domain/Router.java
+++ b/openstack-neutron/src/main/java/org/jclouds/openstack/neutron/v2/domain/Router.java
@@ -172,7 +172,7 @@
             .toString();
    }
 
-   private static abstract class Builder<ParameterizedBuilderType> {
+   private abstract static class Builder<ParameterizedBuilderType> {
       protected Router router;
 
       /**
diff --git a/openstack-neutron/src/main/java/org/jclouds/openstack/neutron/v2/domain/Subnet.java b/openstack-neutron/src/main/java/org/jclouds/openstack/neutron/v2/domain/Subnet.java
index bbbf134..787bc2f 100644
--- a/openstack-neutron/src/main/java/org/jclouds/openstack/neutron/v2/domain/Subnet.java
+++ b/openstack-neutron/src/main/java/org/jclouds/openstack/neutron/v2/domain/Subnet.java
@@ -26,7 +26,6 @@
 import javax.inject.Named;
 import java.beans.ConstructorProperties;
 import java.util.Collection;
-import java.util.Set;
 
 import static com.google.common.base.Preconditions.checkNotNull;
 
@@ -280,7 +279,7 @@
       return new UpdateBuilder();
    }
 
-   private static abstract class Builder<ParameterizedBuilderType> {
+   private abstract static class Builder<ParameterizedBuilderType> {
       protected Subnet subnet;
 
       /**