Fix updating setuptools in Centos

In RHEL-based distributions, updating setuptools using pip removes the
files from the python3-setuptools RPM. It breaks some tools such as
semanage (which is used by diskimage-builder) that use the -s flag of
the python interpreter (don't import modules from /usr/local).
This commit reinstalls python3-setuptools to fix those applications.

Change-Id: Ib44857e83f75acf37823fae912960a801c83cf7f
diff --git a/tools/fixup_stuff.sh b/tools/fixup_stuff.sh
index 1921943..060abb1 100755
--- a/tools/fixup_stuff.sh
+++ b/tools/fixup_stuff.sh
@@ -106,6 +106,16 @@
     # overwriting works.  So this hacks around those packages that
     # have been dragged in by some other system dependency
     sudo rm -rf /usr/lib64/python3*/site-packages/PyYAML-*.egg-info
+
+    # After updating setuptools based on the requirements, the files from the
+    # python3-setuptools RPM are deleted, it breaks some tools such as semanage
+    # (used in diskimage-builder) that use the -s flag of the python
+    # interpreter, enforcing the use of the packages from /usr/lib.
+    # Importing setuptools/pkg_resources in a such environment fails.
+    # Enforce the package re-installation to fix those applications.
+    if is_package_installed python3-setuptools; then
+        sudo dnf reinstall -y python3-setuptools
+    fi
 }
 
 function fixup_suse {