avocado: Store result multiplex file directly in args

When using replay, one can think of the replay_multiplex as of the
normal multiplex files, only it's already processed. This patch
stores the retrieved multiplex file (if not overridden) directly in
multiplex_files and adds support in avocado.core.job to handle this
situation.

Actually some future plugins might benefit from this and create their
own inherited Mux class instead of our multiplexer.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

avocado/core/job.py

@@ -437,8 +437,9 @@ class Job(object):
                      "for details" % (" ".join(urls) if urls else "\b"))
             raise exceptions.OptionValidationError(e_msg)
 
-        if getattr(self.args, 'replay_mux', None) is not None:
-            mux = self.args.replay_mux
+        if isinstance(getattr(self.args, 'multiplex_files', None),
+                      multiplexer.Mux):
+            mux = self.args.multiplex_files     # pylint: disable=E1101
         else:
             try:
                 mux = multiplexer.Mux(self.args)

avocado/plugins/replay.py

@@ -153,6 +153,9 @@ class Replay(CLI):
                 msg = 'Overriding the replay multiplex with '\
                       '--multiplex-file.'
                 view.notify(event='warning', msg=(msg))
+                # Use absolute paths to avoid problems with os.chdir
+                args.multiplex_files = [os.path.abspath(_)
+                                        for _ in args.multiplex_files]
             else:
                 mux = replay.retrieve_mux(resultsdir)
                 if mux is None:
@@ -160,7 +163,7 @@ class Replay(CLI):
                     view.notify(event='error', msg=(msg))
                     sys.exit(exit_codes.AVOCADO_JOB_FAIL)
                 else:
-                    setattr(args, 'replay_mux', mux)
+                    setattr(args, "multiplex_files", mux)
 
         if args.replay_teststatus:
             replay_map = replay.retrieve_replay_map(resultsdir,