Update gitignore and make clean target

Debian build require clean sources (make clean must return the sources
to the state from before build).

.gitignore

@@ -6,3 +6,4 @@ deb/*
 *.o
 .coverage
 *.egg-info
+__pycache__

Makefile

@@ -47,6 +47,11 @@ clean:
 	make -C misc clean
 	make -C qrexec clean
 	make -C qubes-rpc clean
+	make -C doc clean
+	rm -rf qubesagent/*.pyc qubesagent/__pycache__
+	rm -rf test-packages/__pycache__
+	rm -rf test-packages/qubesagent.egg-info
+	rm -rf __pycache__
 
 all:
 	make -C misc

qubes-rpc/.gitignore

@@ -1,6 +1,5 @@
 qubes_add_pendrive_script
 qubes_penctl
-qvm-open-in-dvm
 dvm_file_editor
 qfile-agent
 qfile-agent-dvm