Use setup.py to install calico-diags, instead of deb/rpm incantations

As well as simplicity, this has the advantage that calico-diags will
be correctly installed (including in a virtualenv, if applicable) if
the calico code is installed using 'pip install'.

debian/rules

@@ -15,5 +15,4 @@ override_dh_install:
 	install etc/bird/*.template debian/tmp/usr/share/calico/bird
 	install -d debian/tmp/usr/bin
 	install -m 755 etc/*.sh debian/tmp/usr/bin
-	install -m 755 utils/diags.sh debian/tmp/usr/bin/calico-diags
 	dh_install

rpm/calico.spec

@@ -111,7 +111,6 @@ install -d %{buildroot}%{_datadir}/calico/bird
 install etc/bird/*.template %{buildroot}%{_datadir}/calico/bird
 install -d %{buildroot}%{_bindir}
 install -m 755 etc/*.sh %{buildroot}%{_bindir}
-install -m 755 utils/diags.sh %{buildroot}%{_bindir}/calico-diags
 
 install -d -m 755 %{buildroot}/%{_sysconfdir}/logrotate.d
 install    -m 644 %_sourcedir/calico-felix.logrotate    %{buildroot}/%{_sysconfdir}/logrotate.d/calico-felix

setup.py

@@ -78,5 +78,6 @@ def filter_requirements(filters, file):
             'calico-felix = calico.felix.felix:main',
         ],
     },
+    scripts=['utils/calico-diags'],
     install_requires=collect_requirements()
 )