Run prepare-csit.sh every time

Run prepare-csit.sh every time

 Preparation steps need to be executed every time for Jenkins as
 they do not have all the required libraries preinstalled

 This is a quick fix for a problem introduced in
 https://gerrit.onap.org/r/#/c/integration/csit/+/93698/

 A more proper correction requires refactoring and aligning
 prerequirements for local executions and Jenkins and needs
 analysis and design to be done in future releases

Issue-ID: TEST-197
Signed-off-by: kaihlavi <l.kaihlavirt@partner.samsung.com>
Change-Id: If15935097d2b90b9d49062429194ca7d7a0e4d3d