Remove flaky replica set tests

These tests assume a particular replica set member is always the primary, so tag assertions may fail if a different member is elected. The server-getTags-002.phpt test has more flexible assertions for replica set tags, so we can safely remove these tests.

Author: jmikola

tests/manager/manager-getservers-002.phpt

@@ -3,9 +3,8 @@ MongoDB\Driver\Manager::getServers() (replica set)
 --SKIPIF--
 <?php require __DIR__ . "/../utils/basic-skipif.inc"; ?>
 <?php skip_if_not_replica_set(); ?>
-<?php skip_if_not_enough_nodes(3); ?>
+<?php skip_if_not_enough_nodes(3, 3); ?>
 <?php skip_if_no_arbiter(); ?>
-<?php skip_if_not_clean(); ?>
 --FILE--
 <?php
 require_once __DIR__ . "/../utils/basic.inc";