Use openstackclient>=1.0.2

After changing usage of "openstack role" [1] python-openstackclient
stoppped working with 1.0.1 and less. This patch bumps version to use at
least 1.0.2v.

[1] https://review.openstack.org/#/c/148361

Change-Id: I2fdca28ae97a215cff5e2a6dd7cab2d3321caa6c
Closes-bug: 1413252
diff --git a/stack.sh b/stack.sh
index aeaaf60..4602b0b 100755
--- a/stack.sh
+++ b/stack.sh
@@ -748,7 +748,7 @@
     git_clone_by_name "python-openstackclient"
     setup_dev_lib "python-openstackclient"
 else
-    pip_install 'python-openstackclient>=1.0.0'
+    pip_install 'python-openstackclient>=1.0.2'
 fi