[server][HostResourceQueryOption] Fix a problem that causes the following exception.

The root cause is calling HostgroupsQueryOption::getHostIdColumnName().
Hostgroup tables doesn't have a column for host ID. So the call is invalid.

[INFO] <FaceRest.cc:590> reply error: 4, HTERR_GOT_EXCEPTION: <HostResourceQueryOption.cc:441> ASSERTION failed: [idx < tableProfile.numColumns] : idx: -1, numColumns: 4, table: hostgroups
src/.libs/libhatohol.so.0, HatoholException::saveStackTrace() +0x25, _ZN16HatoholException14saveStackTraceEv+0x25 [0x7fec90e9a645]
src/.libs/libhatohol.so.0, HatoholException::HatoholException(std::string const&, std::string const&, int const&) +0x78, _ZN16HatoholExceptionC1ERKSsS1_RKi+0x78 [0x7fec90e9a748]
src/.libs/libhatohol.so.0, HostResourceQueryOption::getColumnNameCommon(DBAgent::TableProfile const&, unsigned long const&) const +0x12a, _ZNK23HostResourceQueryOption19getColumnNameCommonERKN7DBAgent12TableProfileERKm+0x12a [0x7fec90e9cfea]
src/.libs/libhatohol.so.0, HostResourceQueryOption::getColumnName(unsigned long const&) const +0x16, _ZNK23HostResourceQueryOption13getColumnNameERKm+0x16 [0x7fec90e9d0a6]
src/.libs/libhatohol.so.0, HostResourceQueryOption::getHostIdColumnName() const +0x15, _ZNK23HostResourceQueryOption19getHostIdColumnNameEv+0x15 [0x7fec90e9b895]
src/.libs/libhatohol.so.0, HostResourceQueryOption::getCondition() const +0x424, _ZNK23HostResourceQueryOption12getConditionEv+0x424 [0x7fec90e9c754]
src/.libs/libhatohol.so.0, DBClientHatohol::getHostgroupInfoList(std::list<HostgroupInfo, std::allocator<HostgroupInfo> >&, HostgroupsQueryOption const&) +0xbc, _ZN15DBClientHatohol20getHostgroupInfoListERSt4listI13HostgroupInfoSaIS1_EERK21HostgroupsQueryOption+0xbc [0x7fec90e60f9c]
src/.libs/libhatohol.so.0, UnifiedDataStore::getHostgroupInfoList(std::list<HostgroupInfo, std::allocator<HostgroupInfo> >&, HostgroupsQueryOption const&) +0x2f, _ZN16UnifiedDataStore20getHostgroupInfoListERSt4listI13HostgroupInfoSaIS1_EERK21HostgroupsQueryOption+0x2f [0x7fec90ed14af]
src/.libs/libhatohol.so.0(+0xc7803) [0x7fec90e7a803]
src/.libs/libhatohol.so.0, FaceRest::handlerGetOverview(FaceRest::RestJob*) +0xb49, _ZN8FaceRest18handlerGetOverviewEPNS_7RestJobE+0xb49 [0x7fec90e88579]
src/.libs/libhatohol.so.0, FaceRest::launchHandlerInTryBlock(FaceRest::RestJob*) +0xe, _ZN8FaceRest23launchHandlerInTryBlockEPNS_7RestJobE+0xe [0x7fec90e7c37e]
src/.libs/libhatohol.so.0, FaceRest::Worker::mainThread(HatoholThreadArg*) +0x138, _ZN8FaceRest6Worker10mainThreadEP16HatoholThreadArg+0x138 [0x7fec90e8e5c8]
src/.libs/libhatohol.so.0, HatoholThreadBase::threadStarter(void*) +0x2e, _ZN17HatoholThreadBase13threadStarterEPv+0x2e [0x7fec90e9ab7e]
/lib/x86_64-linux-gnu/libglib-2.0.so.0(+0x6d0f5) [0x7fec913da0f5]
/lib/x86_64-linux-gnu/libpthread.so.0(+0x7f6e) [0x7fec91157f6e]
/lib/x86_64-linux-gnu/libc.so.6, clone+0x6d [0x7fec905cb9cd]
[server][HostResourceQueryOption] Remove unused members.
[server][test][README] Add reference information.
[Client][HatoholPrivilegeEditDialog] Change the column structure.
Merge branch 'issue27-6'
Merge branch 'master' into ready-release-14.03
[server][test][README] Add reference information.
Merge branch 'master' into ready-release-14.03
[server][DBClientUser] Add an API description.
[server][DBClientTest] Fix a typo.

filed ->
field
[server][ActionManger] Execute actions only when the owner exists.
[client][ServersView] Fix a problem in which the delete button is still active after the deletion is executed.

There are the same problems in UsersView and ActionsView. The fixed
function is created in HatoholMonitoringView so that they can use it.
[client][ActionsView] Fix a problem that doesn't disable the delete button after the deletion is completed.
[client][UsersView] Fix a problem that doesn't disable the delete button after the deletion is completed.
[server][testDataStoreZabbix] Fix a potential problem that passes an uninitialized value.
[server][testUtils] Fix a problem that may delete an object while the other thread is using it.
[client][Makefile.am] Create a link forcely so that it can succeed even if the link already exists.
Merge branch 'master' into ready-release-14.03