Do not remove python-pip package on Fedora-23

python on fedora 23 compiled with rewheel support,
in this case the python-pip is a required package, and cannot be
removed.

[1] http://pkgs.fedoraproject.org/cgit/python.git/tree/python.spec?id=3b6fac0339bab69ca5fbf2881568f0565ab0e252#n174

Change-Id: I499b7bec97c4360b32d156079f2b7f3923e3888a
diff --git a/tools/install_pip.sh b/tools/install_pip.sh
index 13c1786..ab5efb2 100755
--- a/tools/install_pip.sh
+++ b/tools/install_pip.sh
@@ -110,7 +110,11 @@
 # Do pip
 
 # Eradicate any and all system packages
-uninstall_package python-pip
+
+# python in f23 depends on the python-pip package
+if ! { is_fedora && [[ $DISTRO == "f23" ]]; }; then
+    uninstall_package python-pip
+fi
 
 install_get_pip