Revert "[server][DBClientHatohol] Strip 'static', because I will add code that calls a non-static method in it."

This reverts commit 0db17738885f6bb0b6cd6e7aafe521b4e6b7ec1c.

makeCondition() has many arguments and is a little complicated.
If its behavior depends on the object state, it becomes
more complicated method.
[server][DBClientHatohol] Show the condition when an assertion fails.
[server][DBClientHatohol] Filter triggers that belong to defunct servers.

NOTE: I am not satisfied with this implementation. It drops
triggers after the DBAgent gets them. DBAgent creates
ItemDataTable (including ItemGroup and ItemData instances)
and it is a little expensive (many memory allocations
are executed). So we should pass a filter condition to
an SQL statement.

I'll do it, right after this.