dbperformance.log is getting a ton of these:
```
2015-04-06 08:10:13 mw1214 wikidatawiki: Expectation (masterConns <= 0) by MediaWiki::main not met:
[connect to 10.64.32.28 (wikidatawiki)]
TransactionProfiler.php line 254 calls wfBacktrace()
TransactionProfiler.php line 112 calls TransactionProfiler->reportExpectationViolated()
LoadBalancer.php line 517 calls TransactionProfiler->recordConnection()
GlobalFunctions.php line 3606 calls LoadBalancer->getConnection()
Block.php line 219 calls wfGetDB()
Block.php line 1034 calls Block->newLoad()
User.php line 1559 calls Block::newFromTarget()
User.php line 1863 calls User->getBlockedStatus()
User.php line 1853 calls User->getBlock()
User.php line 1877 calls User->isBlocked()
OutputPageJsConfigBuilder.php line 67 calls User->isBlockedFrom()
OutputPageJsConfigBuilder.php line 44 calls Wikibase\OutputPageJsConfigBuilder->getUserConfigVars()
OutputPageJsConfigHookHandler.php line 62 calls Wikibase\OutputPageJsConfigBuilder->build()
OutputPageJsConfigHookHandler.php line 40 calls Wikibase\Repo\Hooks\OutputPageJsConfigHookHandler->buildConfigVars()
Wikibase.hooks.php line 1022 calls Wikibase\Repo\Hooks\OutputPageJsConfigHookHandler->handle()
```
The offending line is OutputPageJsConfigBuilder.php:67 where ->isBlockedFrom is called on the master DB