Silently fall back to default configuration if 'derecho.cfg' uses Windows-style CRLF

[songweijia]

@etremel Edward found an issue that if derecho.cfg uses Windows-style CRLF, the configuration loading logic will fall back to the default configuration, making it very hard to find why a derecho service won't start. We should convert the CRLFs in the configuration to UNIX style LF before loading.