python-barbican: satisfy setup.py setup_requires

Commit 8fdbb0381d disallows fetch of code during do_compile task.
This commits extends DEPENDS to python-pbr-native.
Signed-off-by: Babak Sarashki <Babak.SarAshki@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

meta-openstack/recipes-devtools/python/python-barbican_git.bb

@@ -96,6 +96,11 @@ DEPENDS += " \
         python-pbr \
         "
 
+# Satisfy setup.py 'setup_requires'
+DEPENDS += " \
+        python-pbr-native \
+        "
+
 RDEPENDS_${SRCNAME} = "${PN} \
                        ${SRCNAME}-setup \
                        uwsgi \