Factor out read_text_file_contents to ensure that data read from text files is a valid C string. #3359
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Also fixes a potential unterminated string in
thermal_procfs_device_read
.ChangeLog: collectd: Factored out read_text_file_contents for reading text files
and used it to fix a potential unterminated string in the
thermal
plugin./cc @jkohen
[edit @mrunge]: Broke the ChangeLog line, since CI fails on long changelog lines.