POLICY: update of apache-maven repo URL

POLICY: update of apache-maven repo URL

Allow automatic selection of the best apache mirror server
to avoid hardcoded mirror server in apache-maven download
url. This change should increase reliability of POLICY CSIT
test plans in case that some mirror servers are experiencing
issues.
Originally used server is set as preferred, i.e. it still
will be used if it's available.
In case of failure of maven installation, test plan execution
will be terminated with failure.

Change-Id: Ia765652b42e6a20716f5e76304916602852b5654
Issue-ID: POLICY-2046
Signed-off-by: Martin Klozik <martin.klozik@tieto.com>