Fix SFC robot test cases in CSIT

Fix SFC robot test cases in CSIT

This commit is composed of two different changes:
1. Replace ODL_VERSION variable with ODL_STREAM in SFC test cases

ODL_VERSION variable in robot test cases is no longer used and instead
ODL_STREAM is the new name, with the same content.

2. Fix SFC_FUNCTIONS_FILE variable definition in SFC Robot test cases

Definition of variables in robot test cases need to keep separation of
four spaces between the var name and the value

Tested in Jenkins Sandbox: https://jenkins.opendaylight.org/sandbox/job/sfc-csit-3node-clustering-all-beryllium/5/

Change-Id: I37b326d92f534411d45e92f88b2e0f120e6ad506
Signed-off-by: Miguel Angel Munoz Gonzalez <miguel.angel.munoz.gonzalez@ericsson.com>