Sqerl as non-active application

Historically, we made sqerl an active application and included pooler as an included application. We did this to ensure that the active application emysql was fully started before we attempted to start and use a pool of emysql connections. Since chef no longer uses emysql, such a configuration is not needed.

By depending on pooler as a top-level application, we can use pooler in other projects such as depsolver.