If the function succeeds the return value will be the MaxSessionsCount parameter value.
Description:
Use TcpMgrSetMaxSessionsCount to change the maximum number of TCP sessions to be tracked at the same time.
This property means that HNTcpManager while executing of the
TcpMgrProcessPacket function on a new TCP session
detection will register it only if SessionsCount property
value is less or equal to TcpMgrSetMaxSessionsCount.
If TcpMgrSetMaxSessionsCount is equal to 0, then there are no limits for the number of TCP sessions
to be monitored at the same time.