[rsyslog] Add the syslog message format as specified in RFC 5424.#19012

shihhsien-wang wants to merge 1 commit intosonic-net:mastersonic-net/sonic-buildimage:masterfrom

shihhsien-wang:create-predefined-rfc-5424-format-in-rsyslog-confshihhsien-wang/sonic-buildimage:create-predefined-rfc-5424-format-in-rsyslog-confCopy head branch name to clipboard