continuous log occurred at cub_manager after HA fails

[kisoo-han]

• [RND-325]
• When 'support_mon_statistic=YES' at cm.conf, cub_manager gather HA stat periodically (1 min)

1. run 'cubrid heartbeat status' to get HA info.
2. run 'cubrid applyinfo -L {copylogpath} -r {remote_host} -a {dbname} for each DB in replication
3. at the step1, callee parse {copylogpath}, {remote_host}, {dbname} for each DB and returns back to
   callee for run command in step2.
4. Due to bugs in cm_mon_stat::gather_daily_dbs_mon() at cm_mon_stat.cpp, remote_hostname is
   not parsed properly and result to NULL
5. so, 'support_mon_statistic=YES' lead to issue of invalid 'applyinfo' command at every minute,
   and failed messages are LOGGed into cub_manager/applyinfo LOGFILEs.