Replaced some default values and add feature to replace field name

[mardanyan]

-Replaced scheme and port Latest version by default configured get events only on SSL. So make appropriate scheme and port changes.

-Added feature Getting issue on filed name for event after running logs with below command docker run --log-driver=fluentd --log-opt tag="docker.{{.ID}}" ubuntu echo 'Hello Fluentd!' Generated logs has field with name source which is unacceptable by loginsight. Added feature to rename field name with preferable one. Configuration name is replace_field_name, which by default has following mapping config_param :replace_field_name, :hash, default: {"source": "log_source"}, value_type: :string

[vmwclabot]

@mardanyan, you must sign every commit in this pull request acknowledging our Developer Certificate of Origin before your changes are merged. This can be done by adding Signed-off-by: John Doe <john.doe@email.org> to the last line of each Git commit message. The e-mail address used to sign must match the e-mail address of the Git author. Click here to view the Developer Certificate of Origin agreement.

• Commit be5ddf01efeaee327147fbff78f63464921a58d0 must be signed by mrde00@gmail.com

[mardanyan]

New one will be created