Multiple improvements

• New input daemon option, 'service_name' to easily configure micro-service
• service_name used with 'dm_' prefix in process name
• service_name with 'dm_' prefix and '_inst' suffix for forked instance updater
• Unified signal handler for micro-service and main process
• Cli argument '-m' overloaded to support module name in place of plugin path
• Test alignments and improvements