Run phosphor-mapper through pep8

This is all whitespace adjustments flagged by pep8.
diff --git a/setup.cfg b/setup.cfg
index ed3bf6e..483ca76 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -1,2 +1,2 @@
 [install]
-install_scripts=/usr/sbin
+install_scripts = /usr/sbin