[Client][Actions] Show Hostgroup column.
[Client][HatoholHostgroupSelector] Rename HatoholHostgroupDialog to
HatoholHostgroupSelector.

And this dialog is used for selecting hostgroup.
Because, this dialog was based on HatoholHostSelector.
[Server][FaceRest] Use const & and defined typedef for input parameter.
[Client][HatoholHostgroupSelector] Change showing ID.
[Client][HatoholHostgroupSelector] Use the gettext() function.
[Server][FaceRest] Support the "targetHostgroupId" query.
[Client][HatoholAddActionDialog] This dialog is able to post
hostgroupId.
[Client][Actions] Fix wrong variable name.
[Server][DBClientAction] Remove a comment out.
[Client][HatoholAddActionDialog] Fix a wrong query name.
[Client] Fix a wrong file path.
[Server][FaceRest] Remove branch condition.

Because, in current implementation,
there are times when DBClientHatohol::getTriggerInfoList returns some
same trigger information.

Should this function check triggerInfoList has different information?
[Server][FaceRest] Check that don't have different information.
[Server][DBClientAction] Support the "hostgroupId" parameter.
[Server][testDBClientAction] Add the "hostgroupId" member variable.
Merge branch 'master' into issue27-6
Revert "6f6bdd7" "3230eb7"

This reverts commit 6f6bdd7eeb9f043b0d80e2c4d6347f400c75cea0.
This reverts commit 3230eb71cfc8ff0d02442f699544332cf883aa6a.

Because, the hostgroupId member variable was removed at aafea0f
revision. So, these commits are not necesarry.
[Server][DBClientHatohol] Add a comment.
[Server][DBClientAction] Add a new function: takeTriggerInfo

In current implementation, when UnifiedDataStore::addEventList()
function is called, EventInfo doesn't have hostId and severity.
makeActionDefCondition() function need TriggerInfo for complement.
[Server][DBClientAction] Add a new function: getHostgroupIdStringList