Added tests for creation of listeners on same port

Added a test that:
- creates a UDP listener on port 80, after having created a HTTP
  listener on port 80
- creates a second UDP listener on port 80, and ensures that it fails.
- creates a third listener on port 80 with a conflicting protocol over
  TCP.

Story: 2005070
Task: 34781

Change-Id: I2d1d767c360b402bd1a2d924d75fc85279bf8f1d
2 files changed