show rdb_path and aof_path in INFO Command - issue-1069

For #issue-1069

Displaying aof and rdb absolute path in INFO Command

```c
# Persistence
loading:0
rdb_path:/Users/charsyam/works/private/redis-orig/dump.rdb
rdb_changes_since_last_save:0
rdb_bgsave_in_progress:0
rdb_last_save_time:1366851882
rdb_last_bgsave_status:ok
rdb_last_bgsave_time_sec:-1
rdb_current_bgsave_time_sec:-1
aof_enabled:0
aof_path:/Users/charsyam/works/private/redis-orig/appendonly.aof
aof_rewrite_in_progress:0
aof_rewrite_scheduled:0
aof_last_rewrite_time_sec:-1
aof_current_rewrite_time_sec:-1
aof_last_bgrewrite_status:ok
```