1. Make the functions reset_session_buffers() and grab_incoming()

1. Make the functions reset_session_buffers() and grab_incoming()
static, since no other source file references them by name.

2. Delete various fragments of dead, obsolete, commented-out code.

3. In init_transport: delete the cleanup code after failure
of previous calls to buffer_init().  It's unreachable, since
buffer_init() can never return NULL.

4. Change transport_session.c so that it uses buffer_add_n()
instead of passing data through an intermediate buffer.

git-svn-id: svn://svn.open-ils.org/OpenSRF/trunk@1573 9efc2488-bf62-4759-914b-345cdb29e865