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live config changes: add RefreshOptions method (#294)
Added a method and options to support reading configuration changes to options periodically while a process is running. Every "refresh_options_sec", the periodic task scheduler runs a task to check if the "refresh_options_file" exists. If it does, the file is loaded as an options file and the mutable options from the file are updated in the running process (via SetDBOptions and SetOptions). Once updated, the refresh file is deleted. If an error occurs, it will be written to the log file. Note that the file is read as an Options file and must be a valid Options file. This means that the file must have a DBOptions section and at least one ColumnFamilyOptions section. Only options that are mutable can be in this file -- immutable options will cause an error and abort the processing. Additionally, note that TableFactory options must be specified as part of the ColumnFamilyOptions. For example, to change the block size, the "table_factory.block_size" option should be set in the appropriate ColumnFamilyOptions. Options set in a TableFactory section will be ignored. Currently tested manually via db_bench. Unit tests will be forthcoming.
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