Add python-setuptools as required preinstalled package

On some kind-of-minimalistic  Ubuntu 18.04.1 extra python package `python-setuptools` was needed in order to compile from source the final DEB.

```
dpkg-buildpackage: info: source version 1.2.1
dpkg-buildpackage: info: source changed by Julien Fortin <julien@cumulusnetworks.com>
 dpkg-source --before-build ifupdown2
dpkg-buildpackage: info: host architecture amd64
dpkg-checkbuilddeps: error: Unmet build dependencies: python-setuptools
dpkg-buildpackage: warning: build dependencies/conflicts unsatisfied; aborting
```

diff --git a/README.rst b/README.rst
index 091bbfb728561cea0f76a486b68138d1039bf0a3..c6a5e754f3682bb4889701cf734a1b60a7fa624b 100644 (file)
--- a/README.rst
+++ b/README.rst
@@ -50,7 +50,7 @@ You might need to manually download dependencies. Mandatory dependencies:
 
 .. code-block:: console
 
-    $ apt-get install build-essential devscripts dh-systemd fakeroot python-all python-docutils iproute2 python-ipaddr python-argcomplete
+    $ apt-get install build-essential devscripts dh-systemd fakeroot python-all python-docutils iproute2 python-ipaddr python-argcomplete python-setuptools
 
 Suggested dependencies: