Install and configure python-heatclient.

This uses the new REST API. It installs a client executable called 'heat'.
The old heat client in the heat repo has been renamed to heat-cfn.

Change-Id: I7bc8662c531e3639cc940a44df96ff426ac3aada
diff --git a/stack.sh b/stack.sh
index 1cd1e1a..4d76949 100755
--- a/stack.sh
+++ b/stack.sh
@@ -852,6 +852,7 @@
 fi
 if is_service_enabled heat; then
     install_heat
+    install_heatclient
 fi
 if is_service_enabled cinder; then
     install_cinder
@@ -906,6 +907,7 @@
 fi
 if is_service_enabled heat; then
     configure_heat
+    configure_heatclient
 fi
 if is_service_enabled cinder; then
     configure_cinder