support for multiple clusters in manage

This is to allow the users to select the cluster
for which the configuration needs to be displayed.

The pages will be refreshed automatically
according to the selection of the cluster.

Signed-off-by: Kanagaraj M <kmayilsa@redhat.com>
improve the style of cluster selector

In Manage page, modified the style of cluster-selector
to make it aligned with rest of the items in the top bar.

Signed-off-by: Kanagaraj M <kmayilsa@redhat.com>
Merge pull request #71 from kmkanagaraj/manage-multi-cluster

Manage multi cluster