Add "region" config for each service

Added config items are:
    compute.region
    image.region
    network.region
    volume.region
    object_storage.region
    orchestration.region

RestClient decides target endpoints according to these values. If
these values are not set, the value of identity.region is used
instead.

Fixes bug 1210039

Change-Id: If2a01fae2893ee5740a94e97389164eb000538d7
Adding LB member operation test cases

Testcases for LB member operation were missing.
I have added LB member create, delete, update, list and show test cases.
Also xml support for the same is provided.

Change-Id: I0db9a6724856afebbc272f43fc3801cdaf3061e5
Adding health monitoring test case

Test cases for health monitoring (load balancer) were missing.
I have added list, show, create, update, delete,associate, disassociate
test cases fot health monitoring.

Change-Id: If123d9bf8f11babc760ca8fbcbc0d6c9931d138b
Merge "Add "region" config for each service"
Merge "Adding LB member operation test cases"
Merge "Adding health monitoring test case"