Add new unit tests.

[sybenzvi]

Added a test of the snews_pt connection to the server.

[KaraMelih]

This is the logic that I am going for.

Right now we have the

• red line connections (observation messages from snews_pt, coincidence search in snews_cs, and alert back to user via snews_pt)
• green line connections (snews_pt testing connection, snews_cs receiving and sending a confirmation, snews_pt reading it back)

We need to implement the blue line connections for the tests. This flow ensures that the coincidence instance is up and running on snews_cs and does not mess with the main alert feed (red line)

[KaraMelih]