lib: Revise port construct in application

The application had a port construct, which is a leftover from the
early days implementing RINA specs, which had a "port_id" to access
flows. O7s doesn't really have a "port" concept, only flows. The
port_wait_assign function was used in the IPCP to wait for the IRMd to
assign the flow_id and return so the flow object could be created.

This renames things a bit, and also simplifies the locking to us a
single lock/condvar for managing flows. This should be further
improved to move the flow state into the flow object, maintain a
double mapping of to flow objects (id_to_flow and fd_to_flow) and
malloc flow objects at flow allocation, instead of keeping the full
table in memory at init to further reduce memory footprint.

Signed-off-by: Dimitri Staessens <dimitri@ouroboros.rocks>
Signed-off-by: Sander Vrijders <sander@ouroboros.rocks>

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