Add get-pip.py/*.qcow2 to .gitignore

files/get-pip.py and *.qcow2 are installed by DevStack itself. So
we shouldn't manage it with the git repository.

Change-Id: Ib22ed814d3d3eb33ef3ff45874b0ff36b2036cf5
diff --git a/.gitignore b/.gitignore
index 4365202..1840352 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,8 +7,10 @@
 localrc
 local.sh
 files/*.gz
+files/*.qcow2
 files/images
 files/pip-*
+files/get-pip.py
 stack-screenrc
 *.pem
 accrc