[Server][DBClientZabbix] Add a new function:
transformHostsItemGroupToHatoholFormat
[Server][DBClientZabbix] Add a new function:
transformHostsToHatoholFormat
[Server][DBClientHatohol] Add a new function: addHostInfoBare

I think "Bare" is an ambiguos name. But, I named this function to
"addHostInfoBare". Because, it was named by the rules of conventional.

I want to change these name. But, priority is lower.