Allow user to specify log level for info_log
Summary: Currently, there is no easy way for user to change log level of info log. Add a parameter in options to specify that. Also make the default level to INFO level. Removing the [INFO] tag if it is INFO level as I don't want to cause performance regression. (add [LOG] means another mem-copy and string formatting). Test Plan: make all check manual check the levels work as expected. Reviewers: dhruba, yhchiang Reviewed By: yhchiang CC: dhruba, igor, i.am.jin.lei, ljin, haobo, leveldb Differential Revision: https://reviews.facebook.net/D16563
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