MSSQL and MySQL peer format can be changed to the same format as java by configuration

[inversionhourglass]

Please answer these questions before submitting pull request

• Why submit this pull request?

• Bug fix

• New feature provided

• Improve performance

• Related issues

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Bug fix

• Bug description.

• How to fix?

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New feature or improvement

• Describe the details and related test reports.
  The database peer format in java is unified as host:port

    public ConnectionInfo(OfficialComponent component, String dbType, String host, int port, String databaseName) {
        this.dbType = dbType;
        this.databasePeer = host + ":" + port;
        this.databaseName = databaseName;
        this.component = component;
    }

But in .NET, DbConnection.DataSource is generally used directly, and this format is generally not host:port. Different formats of the same database peer in .NET and Java will result in separate statistics for virtual databases. I've only changed the format for MSSQL and MySQL so far because I only use those two.

java agent数据库采集部分peer采用了统一的格式host:port，.NET中一般直接使用DbConnection.DataSource，格式基本都不是host:port，如果.NET和java使用同一个库，最后在虚拟数据库界面上会显示两个实例，这个PR增加了一个配置可以支持使用java agent相同的格式，默认还是之前的格式。这个PR中只支持MSSQL和MySQL，其他数据库我没用到就先不改了。

{
  "SkyWalking": {
    "Tracing": {
      "DbPeerSimpleFormat": false      // default false
    }
  }
}

[liuhaoyang]

LGTM

[inversionhourglass]

Is this forgot to merge?

[wu-sheng]

Done