SERVER_PORT for UI and CLI tests depends on env variables

Nailgun web server listens on port depending on
FUELCLIENT_SERVER_PORT and UI_SERVER_PORT variables

Default port for UI tests - 5544
Default port for CLI tests - 8003

Each subproject should use its own server to guarantee
some environment isolation

Change-Id: I816958d31b51fcd16e5defbdf3e822eab3a085cd
Closes-Bug: #1282565
Merge "SERVER_PORT for UI and CLI tests depends on env variables"