resource/alicloud_db_instance:add certificate, passWord, privateKey.

[chengzhengyubian]

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[xuzhang3]

@chengzhengyubian Can you add new test case or update existed test case to cover the new feature and changes? Also if possible please share the AccTest result log.

Example:

=== RUN   TestAccAliCloudCloudFirewallVpcFirewallControlPolicyOrder_basic12717
--- PASS: TestAccAliCloudCloudFirewallVpcFirewallControlPolicyOrder_basic12717 (27.50s)
=== RUN   TestAccAliCloudCloudFirewallVpcFirewallControlPolicy_basic_no_order
--- PASS: TestAccAliCloudCloudFirewallVpcFirewallControlPolicy_basic_no_order (20.22s)
=== RUN   TestAccAliCloudCloudFirewallVpcFirewallControlPolicy_basic11929
--- PASS: TestAccAliCloudCloudFirewallVpcFirewallControlPolicy_basic11929 (68.67s)
=== RUN   TestAccAliCloudCloudFirewallVpcFirewallControlPolicy_basic11929_twin0
--- PASS: TestAccAliCloudCloudFirewallVpcFirewallControlPolicy_basic11929_twin0 (18.96s)
=== RUN   TestAccAliCloudCloudFirewallVpcFirewallControlPolicy_basic11929_twin1
--- PASS: TestAccAliCloudCloudFirewallVpcFirewallControlPolicy_basic11929_twin1 (19.81s)
=== RUN   TestAccAliCloudCloudFirewallVpcFirewallControlPolicy_basic12022
--- PASS: TestAccAliCloudCloudFirewallVpcFirewallControlPolicy_basic12022 (80.12s)
=== RUN   TestAccAliCloudCloudFirewallVpcFirewallControlPolicy_basic12022_twin0
--- PASS: TestAccAliCloudCloudFirewallVpcFirewallControlPolicy_basic12022_twin0 (20.30s)
=== RUN   TestAccAliCloudCloudFirewallVpcFirewallControlPolicy_basic12022_twin1
--- PASS: TestAccAliCloudCloudFirewallVpcFirewallControlPolicy_basic12022_twin1 (21.05s)