[log] initial log messages
[net/session] we can't return from m_socket.async_read_some() callback

If we want to read some data after, we must to rebind callback.
[net/session] fix command parsing

Fixes:
- istream.getline() - don't contain "\n" in output buffer
- istream.get() - split by new line, and add NULL byte
- istream.read() - don't do anything, except reading
- log messages
- m_commandOffset must set to 0 at the begining
[net/session] fix double free or corruption (fasttop)