Allow Karaf to listen to alternative RMI ports

Allow Karaf to listen to alternative RMI ports

In Karaf post-install script for tests
- generate configuration files templates for Karaf Management
- patch Karaf exec to generate configuration files from environment
  variables and templates

In tox.ini
- declare the related variables in SETENV parameters

Allowing the controller configuration to listen to alternative ports
is a commodity to run functional tests in parallel.

JIRA: TRNSPRTPCE-482
Signed-off-by: guillaume.lambert <guillaume.lambert@orange.com>
Change-Id: Ic2f0db92b9da14fcd65fc9840aa4365b8f9469f8