Fix auto-forcenew upgrade tencentcloud-terraform SDK with resource tencentcloud_mysql_instance

[gailwang]

The issue is:

$ terraform apply
2020/07/02 19:49:39 [WARN] Log levels other than TRACE are currently unreliable, and are supported only for backward compatibility.
  Use TF_LOG=TRACE to see Terraform's internal logs.
  ----
tencentcloud_mysql_instance.mysql_master: Refreshing state... [id=cdb-i5ire7nz]

An execution plan has been generated and is shown below.
Resource actions are indicated with the following symbols:
-/+ destroy and then create replacement

Terraform will perform the following actions:

  # tencentcloud_mysql_instance.mysql_master must be replaced
-/+ resource "tencentcloud_mysql_instance" "mysql_master" {
        auto_renew_flag   = 0
        availability_zone = "ap-guangzhou-3"
      + charge_type       = "POSTPAID" # forces replacement
        engine_version    = "5.7"
        first_slave_zone  = "ap-guangzhou-3"
      + force_delete      = false
      ~ gtid              = 1 -> (known after apply)
      ~ id                = "cdb-i5ire7nz" -> (known after apply)
        instance_name     = "testAccMysql"
      + internet_host     = (known after apply)
      ~ internet_port     = 0 -> (known after apply)
        internet_service  = 0
      ~ intranet_ip       = "10.66.199.250" -> (known after apply)
        intranet_port     = 3360
      ~ locked            = 0 -> (known after apply)
        mem_size          = 1000
      - parameters        = {} -> null
      - pay_type          = 1 -> null # forces replacement
        period            = 1
      + prepaid_period    = 1
        project_id        = 0
        root_password     = (sensitive value)
      - security_groups   = [] -> null
        slave_deploy_mode = 0
        slave_sync_mode   = 0
      ~ status            = 1 -> (known after apply)
      - tags              = {} -> null
      ~ task_status       = 0 -> (known after apply)
        volume_size       = 50
    }

Plan: 1 to add, 0 to change, 1 to destroy.

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after fix:

$ terraform apply
2020/07/02 19:50:50 [WARN] Log levels other than TRACE are currently unreliable, and are supported only for backward compatibility.
  Use TF_LOG=TRACE to see Terraform's internal logs.
  ----
tencentcloud_mysql_instance.mysql_master: Refreshing state... [id=cdb-i5ire7nz]

An execution plan has been generated and is shown below.
Resource actions are indicated with the following symbols:
  ~ update in-place

Terraform will perform the following actions:

  # tencentcloud_mysql_instance.mysql_master will be updated in-place
  ~ resource "tencentcloud_mysql_instance" "mysql_master" {
        auto_renew_flag   = 0
        availability_zone = "ap-guangzhou-3"
        engine_version    = "5.7"
        first_slave_zone  = "ap-guangzhou-3"
      + force_delete      = false
        gtid              = 1
        id                = "cdb-i5ire7nz"
        instance_name     = "testAccMysql"
        internet_port     = 0
        internet_service  = 0
        intranet_ip       = "10.66.199.250"
        intranet_port     = 3360
        locked            = 0
        mem_size          = 1000
        parameters        = {}
      - pay_type          = 1 -> null
        period            = 1
      + prepaid_period    = 1
        project_id        = 0
        root_password     = (sensitive value)
        security_groups   = []
        slave_deploy_mode = 0
        slave_sync_mode   = 0
        status            = 1
        tags              = {}
        task_status       = 0
        volume_size       = 50
    }

Plan: 0 to add, 1 to change, 0 to destroy.