Accept maven configuration in Python tox sonar

Accept maven configuration in Python tox sonar

Extend lf_tox_sonar with parameters macro lf-infra-maven-parameters
so job definitions can configure mvn-opts, mvn-params and mvn-version
values. Default values are defined so existing jobs are not affected.
This change makes the python-tox sonar template consistent with the
maven sonar template.

Extend the PyPI package structure recommendation with a way to share
the docs/ folder.

Change-Id: I2f785cabc9058238d36505c8b4af8f87114a685a
Issue-Id: RELENG-2677
Signed-off-by: Lott, Christopher (cl778h) <cl778h@att.com>