Allow use of onos docker for existing tests

- Allow Cluster to pull/build onos docker
- Connect clidriver to cli runnning in docker
- Some changes for debugability in components
- To use, set the useDocker and diffCliHosts tags in the cluster
  component to True, then define parameters in the params file
- Update all SR Stratum tests to use the tost docker image
- NOTE: Since the tost-onos image doesn't have openflow installe, we are
  currently only using docker for the bmv2 and tofino switches

Change-Id: If900b0bdbf9a41b8885c692ccba18a3b1bc580cc
diff --git a/TestON/tests/USECASE/SegmentRouting/SRBridging/SRBridging.topo.physical b/TestON/tests/USECASE/SegmentRouting/SRBridging/SRBridging.topo.physical
index 905d24b..37e1830 100644
--- a/TestON/tests/USECASE/SegmentRouting/SRBridging/SRBridging.topo.physical
+++ b/TestON/tests/USECASE/SegmentRouting/SRBridging/SRBridging.topo.physical
@@ -8,6 +8,8 @@
             <connect_order>1</connect_order>
             <home></home>   # defines where onos home is on the build machine. Defaults to "~/onos/" if empty.
             <COMPONENTS>
+                <useDocker></useDocker>  # Whether to use docker for ONOS nodes
+                <docker_prompt>~/onos#</docker_prompt>
                 <cluster_name></cluster_name>  # Used as a prefix for cluster components. Defaults to 'ONOS'
                 <diff_clihost></diff_clihost> # if it has different host other than localhost for CLI. True or empty. OC# will be used if True.
                 <karaf_username></karaf_username>