ConnectionTrackingCoordinator should be optional

The leaked connection tracker should be optional because it has a performance impact:

• it generates an Exception to get the code path for each getConnection

  java.lang.Throwable.<init>(String)	230 678
  org.nuxeo.runtime.jtajca.NuxeoContainer$ConnectionTrackingCoordinator$Context$Allocation.<init>(ConnectionInfo)	230 678
  org.nuxeo.runtime.jtajca.NuxeoContainer$ConnectionTrackingCoordinator.handleObtained(ConnectionTrackingInterceptor, ConnectionInfo, boolean)	230 678
  org.apache.geronimo.connector.outbound.ConnectionTrackingInterceptor.getConnection(ConnectionInfo)	230 678
  org.apache.geronimo.connector.outbound.AbstractConnectionManager.allocateConnection(ManagedConnectionFactory, ConnectionRequestInfo)	230 678
  org.nuxeo.runtime.jtajca.NuxeoContainer$ConnectionManagerWrapper.allocateConnection(ManagedConnectionFactory, ConnectionRequestInfo)	230 678
  

  Note that geronimo also keep a code path:

  java.lang.Exception.<init>(String)	243 896
  org.apache.geronimo.connector.outbound.ConnectionInfo.setTrace()	230 673
  org.apache.geronimo.connector.outbound.ConnectionHandleInterceptor.getConnection(ConnectionInfo)	230 673
  org.apache.geronimo.connector.outbound.TCCLInterceptor.getConnection(ConnectionInfo)	230 673
  org.apache.geronimo.connector.outbound.ConnectionTrackingInterceptor.getConnection(ConnectionInfo)	230 673
  org.apache.geronimo.connector.outbound.AbstractConnectionManager.allocateConnection(ManagedConnectionFactory, ConnectionRequestInfo)	230 673      org.nuxeo.runtime.jtajca.NuxeoContainer$ConnectionManagerWrapper.allocateConnection(ManagedConnectionFactory, ConnectionRequestInfo)	230 673
  

• it uses a finalyzer which is bad for GC perf.

• The geronimo ConnectionInfo.toString() call a ManagedConnectionInfo.toString() which allocates tons of strings