Make "eval.php -d 2" work again

Make "eval.php -d 2" work again

Instead of iterating through load balancer info, just set the flag in
the master and replica connections, since that seems more robust.

Deprecate LoadBalancer::setServerInfo() and
LoadBalancer::getServerInfo(), no remaining callers in core or
in-tree extensions, I think I added the function just for this feature.

Do a service reset, since Logger instances are injected into
LoadBalancer by ServiceWiring (via MWLBFactory::applyDefaultConfig()).
Similarly CryptRand, MimeAnalyzer.

Fix the usage text for shell.php

Change-Id: I3e85a6e8cfa1243a0371cfb3ce1c18665e8c711d