modify so that each log entry is written in one line with properly p…

[a5hlynx]

Hi Yogesh-san,

As far as I try the latest version of UnifiedLogReader in LOG_DEFAULT mode, the timestamp of each log entry is not properly written.
Also, I found the followings about the line break, both of which I believe are not what you originally intented.

• In LOG_DEFAULT, the first log entry starts right after the header without line break, and some log entries contain line breaks within themselves.
• In TSV_ALL, the header and all the log entries are written in one line.

I modified the code so as to eliminate the issues above, and if my modification seems OK to you, can you merge it to your branch?

Best regards,
Yuya Hashimoto