Adapt lighty to run with optional karaf features

Adapt lighty to run with optional karaf features

- put tapi as an optional feature to install in lighty, as it is the
  case with karaf
- add use of two new environment variables (INSTALL_NBINOTIFICATIONS and
  INSTALL_TAPI) to start lighty with nbinotifications and tapi features
- adapt lighty launcher shell script to take into acount these
  environment variables, as well as the OLM_TIMER ones
- adapt tox consequently

JIRA: TRNSPRTPCE-663
Signed-off-by: Gilles Thouenon <gilles.thouenon@orange.com>
Change-Id: I85c9a27f38de01343e4f13ce548440a9171502b1