some enhancements for mongodb and server protocol version

[bitgandtter]

• clean mongodb if available
• set SERVER_PROTOCOL on $_SERVER to request protocol version

[andig]

@acasademont lgtm?

[acasademont]

Sure! Should we slpit these changes in 2 different commits? Also, AFAIK (not 100% as i don’t use mongo), symfony should clean the entity managers automatically, those were little hacks that were needed before the ResetInterface came to life.

[bitgandtter]

@acasademont we are using mongodb and we need this kind of hack in order to clean the managers not the automatic handler. Even when both are under the doctrine umbrella orm receive much of this enhancements but odm don't