SGXPlatformRegistration: Support no-daemon mode and configurable log file

[gw0]

In order to allow integrating the SGXPlatformRegistration service with various Linux systems/process managers it would be nice if it would support a no-daemon mode (to log to stdout) and have a configurable log file (not fixed to /var/log/mpa_registration.log). These options could either be passed in as parameters, or in the config file (/etc/mpa_registration.conf).

Currently there is no no-daemon option and the LOG_FILE is hard-coded:

• https://github.com/intel/SGXDataCenterAttestationPrimitives/blob/11627935938c1f50d1084262c464c54a6e7324a0/tools/SGXPlatformRegistration/common/inc/logger.h#L44