Provisioning task to take care of rsyslog client to contrail-collector
connections in a topology.

This task executes on every node in the topology to edit the client/
contrail-collector configuration files and restart the services. The
connections i.e. parameters as - port no, protocol etc have to be
mentioned in the testbed.py files.

fabfile/tasks/helpers.py - consists of helper functions to get round robin
association of contrail-collectors in the topology

fabfile/tasks/provision.py and fabfile/utils/provision_rsyslog_connect.py -
consists of the main code base for the provisioning task.

fabfile/testbeds/testbed_multibox_example.py and
fabfile/testbeds/testbed_singlebox_example.py - lists example connection
setup/configuration options and default values for each.

Change-Id: I15c97bac0fcc208c50601ea367904dad3dc9f275
Merge "Provisioning task to take care of rsyslog client to contrail-collector connections in a topology." into R1.10