Make bootstrap.py executable to exclude it from nosetests and rename bootstrap to multi-bootstrap

Signed-off-by: Gora Khargosh <gora.khargosh@gmail.com>
diff --git a/bootstrap.py b/bootstrap.py
old mode 100644
new mode 100755
diff --git a/bootstrap b/multi-bootstrap
similarity index 100%
rename from bootstrap
rename to multi-bootstrap