[BACKLOG-1479]: Implement support for Carte parameters (threads and connections)

Implement necessary code changes to support configuring the following options for Carte:
acceptors, acceptQueueSize, lowResourcesMaxIdleTime.
lowResourcesConnections option is not supported by org.mortbay.jetty.bio.SocketConnector that is used in the current implementation of Carte web server so it's out of scope.
Also there are unit tests.
Merge pull request #867 from TatsianaKasiankova/BACKLOG-1479

[BACKLOG-1479]: Implement support for Carte parameters (threads and connections)