Users: Introduce the `manage_users_extra_tablenav` action, fired immediately outside the closing "actions" div in the Users list table tablenav.

A similar `manage_posts_extra_tablenav` hook fires in the same location and context in the Posts list table tablenav.

Props GunGeekATX, adamsilverstein.
Fixes #36990.

Built from https://develop.svn.wordpress.org/trunk@40974


git-svn-id: http://core.svn.wordpress.org/trunk@40824 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/class-wp-users-list-table.php

@@ -281,7 +281,18 @@ class WP_Users_List_Table extends WP_List_Table {
 		 * @param string $which The location of the extra table nav markup: 'top' or 'bottom'.
 		 */
 		do_action( 'restrict_manage_users', $which );
-		echo '</div>';
+	?>
+		</div>
+	<?php
+		/**
+		 * Fires immediately following the closing "actions" div in the tablenav for the users
+		 * list table.
+		 *
+		 * @since 4.9.0
+		 *
+		 * @param string $which The location of the extra table nav markup: 'top' or 'bottom'.
+		 */
+		do_action( 'manage_users_extra_tablenav', $which );
 	}
 
 	/**

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-alpha-40973';
+$wp_version = '4.9-alpha-40974';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.