test-runner: move process cleanup into kill()

This moves all the de-init code into kill(), which fixes a few
reference issues causing processes to hang around longer than
desired. If the process terminates on its own and/or the last
reference is lost __del__ will kill the process and clean up.

tools/test-runner

@@ -161,6 +161,7 @@ class Process:
 	'''
 	def __init__(self, args, wait=False, env=None, ctx=None, check=False,
 				outfile=None, namespace=None, need_out=False, cleanup=None):
+		self.killed = False
 		self.args = args
 		self.wait = wait
 		self.name = args[0]
@@ -238,6 +239,7 @@ class Process:
 			return
 
 		self.pid.wait()
+		self.killed = True
 
 		self.stdout.seek(self.io_position)
 		self.out = self.stdout.read()
@@ -282,34 +284,49 @@ class Process:
 
 	def __del__(self):
 		print("Del process %s" % self.args)
-		self.stdout.close()
 
-		if self.io_watch:
-			GLib.source_remove(self.io_watch)
+		if not self.killed:
+			self.kill()
 
-		for f in self.write_fds:
-			f.close()
-
-		try:
 		os.remove(self.output_name)
-		except:
-			pass
-
-		if self.cleanup:
-			self.cleanup()
 
 	def kill(self, force=False):
 		print("Killing process %s" % self.args)
 
+		if self.killed:
+			return
+
 		if force:
-			os.kill(self.pid.pid, signal.SIGKILL)
-		else:
 			self.pid.kill()
+		else:
+			self.pid.terminate()
 
 		self.pid.wait(timeout=15)
 		self.pid = None
+
+		if self.ctx and self in self.ctx.processes:
+			self.ctx.processes.remove(self)
+
+		self.ctx = None
+
+		for f in self.write_fds:
+			f.close()
+
 		self.write_fds = []
 
+		if self.io_watch:
+			GLib.source_remove(self.io_watch)
+			self.io_watch = None
+
+		if self.cleanup:
+			self.cleanup()
+
+		self.cleanup = None
+
+		self.stdout.close()
+
+		self.killed = True
+
 	def wait_for_socket(self, socket, wait):
 		waited = 0
 		while not os.path.exists(socket):
@@ -607,7 +624,6 @@ class Namespace:
 
 	def stop_process(self, p, force=False):
 		p.kill(force)
-		self.processes.remove(p)
 
 	def is_process_running(self, process):
 		for p in self.processes: