Description of problem:
List of issues with the existing configuration management in Geo-replication.

- On every Glusterd restart, it generates new gsyncd_template.conf. This should be avoided by generating template conf file only once during installation/upgrade
- Session configuration file is copy of template conf file, This is not required. Only modified config items should be saved in session config.
- Config set should set only if previous value is different than current value. This causes Geo-rep session restarts even though no changes in config.
- All config change causes session restart, We should have separate groups of configs - restart_configs, reload_configs
- No way to get list of default configurations, unless we look in the code.
- Clear distinction for info configs and modifiable config options is not available.
- Some config default values are added in code and for some deafault values added in template conf. Every default conf should be moved to template/default config.