Add missing mongodb client package on Fedora

On Fedora, when ceilometer is enabled and mongodb is used as backend,
devstack installation would fail due to missing mongodb client package.
This patch ensures the package gets installed.

Change-Id: I981bb55f86541e5ff19c52160269a7789b94423f

files/rpms/ceilometer-collector

@@ -1,3 +1,4 @@
 selinux-policy-targeted
 mongodb-server
 pymongo
+mongodb # NOPRIME

lib/ceilometer

@@ -151,6 +151,8 @@ function configure_ceilometer() {
 
 function configure_mongodb() {
     if is_fedora; then
+        # install mongodb client
+        install_package mongodb
         # ensure smallfiles selected to minimize freespace requirements
         sudo sed -i '/--smallfiles/!s/OPTIONS=\"/OPTIONS=\"--smallfiles /' /etc/sysconfig/mongod