add keypair option on server create/boot

Author: gondor

src/main/java/org/openstack4j/model/compute/builder/ServerCreateBuilder.java

@@ -63,4 +63,10 @@ public interface ServerCreateBuilder extends Buildable.Builder<ServerCreateBuild
 	 */
 	ServerCreateBuilder addSecurityGroup(String name);
 
+	/**
+	 * Associates this Server with a public keypair name
+	 * @param name the name of the public keypair
+	 */
+	ServerCreateBuilder keypairName(String name);
+	
 }

src/main/java/org/openstack4j/openstack/compute/domain/NovaServerCreate.java

@@ -239,5 +239,11 @@ public ServerCreateConcreteBuilder from(ServerCreate in) {
 			m = (NovaServerCreate)in;
 			return this;
 		}
+
+		@Override
+		public ServerCreateBuilder keypairName(String name) {
+			m.keyName = name;
+			return this;
+		}
 	}
 }