Reuse common port-related test fixtures

Most Python-based system tests need to know which ports were assigned to
a given test by bin/tests/system/get_ports.sh.  This is currently
handled by inspecting the values of various environment variables (set
by bin/tests/system/run.sh) and passing the port numbers to Python
scripts via pytest fixtures.  However, this glue code has so far been
copy-pasted into each system test using it, rather than reused.

Since pytest also looks for conftest.py files in parent directories,
move commonly used fixtures to bin/tests/system/conftest.py.  Set the
scope of all the moved fixtures to "session" as their return values are
only based on environment variables, so there is no point in recreating
them for every test requesting them.  Adjust test code accordingly.

bin/tests/system/doth/conftest.py

@@ -11,7 +11,6 @@
 # See the COPYRIGHT file distributed with this work for additional
 # information regarding copyright ownership.
 
-import os
 import shutil
 import subprocess
 
@@ -36,8 +35,3 @@ def gnutls_cli_executable():
         pytest.skip('gnutls-cli does not support the --logfile option')
 
     return executable
-
-
-@pytest.fixture
-def named_tlsport():
-    return int(os.environ.get('TLSPORT', '853'))