serveronly: deduplicate code with the main evolve extension Now that 'serveonly' is a sub module of evolve. We can access its content in evolve. As a result we stop duplicating code all common parts are defined in the 'serveronly' module and imported by evolve when needed.

test-drop.t
test-inhibit.t
test-simple4server.t
tests/test-simple4server-bundle2.t